Re: [PATCH 2/2] include/linux/typecheck.h: Zero initialize dummy variables

2 May 2025


      Hi Nathan,
kernel test robot noticed the following build errors:
[auto build test ERROR on ebd297a2affadb6f6f4d2e5d975c1eda18ac762d]
url:    https://github.com/intel-lab-lkp/linux/commits/Nathan-Chancellor/kbuild-Disa...
base:   ebd297a2affadb6f6f4d2e5d975c1eda18ac762d
patch link:    https://lore.kernel.org/r/20250501-default-const-init-clang-v1-2-3d2c6c185db...
patch subject: [PATCH 2/2] include/linux/typecheck.h: Zero initialize dummy variables
config: arc-randconfig-002-20250502 (https://download.01.org/0day-ci/archive/20250502/202505021716.olmL8WzB-lkp@i...)
compiler: arc-linux-gcc (GCC) 12.4.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250502/202505021716.olmL8WzB-lkp@i...)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot lkp@intel.com
| Closes: https://lore.kernel.org/oe-kbuild-all/202505021716.olmL8WzB-lkp@intel.com/
All errors (new ones prefixed by >>):
In file included from include/linux/preempt.h:11,
                    from include/linux/sched.h:15,
                    from arch/arc/kernel/asm-offsets.c:6:
   include/linux/irqflags.h: In function 'class_irqsave_destructor':
...
...
include/linux/typecheck.h:10:24: error: empty scalar initializer
10 | ({      type __dummy = {}; \
         |                        ^
   include/linux/cleanup.h:385:25: note: in definition of macro '__DEFINE_UNLOCK_GUARD'
     385 |         if (_T->lock) { _unlock; }                                      \
         |                         ^~~~~~~
   include/linux/irqflags.h:266:1: note: in expansion of macro 'DEFINE_LOCK_GUARD_0'
     266 | DEFINE_LOCK_GUARD_0(irqsave,
         | ^~~~~~~~~~~~~~~~~~~
   include/linux/irqflags.h:188:17: note: in expansion of macro 'typecheck'
     188 |                 typecheck(unsigned long, flags);        \
         |                 ^~~~~~~~~
   include/linux/irqflags.h:223:22: note: in expansion of macro 'raw_irqs_disabled_flags'
     223 |                 if (!raw_irqs_disabled_flags(flags))    \
         |                      ^~~~~~~~~~~~~~~~~~~~~~~
   include/linux/irqflags.h:268:21: note: in expansion of macro 'local_irq_restore'
     268 |                     local_irq_restore(_T->flags),
         |                     ^~~~~~~~~~~~~~~~~
   include/linux/typecheck.h:10:24: note: (near initialization for '__dummy')
      10 | ({      type __dummy = {}; \
         |                        ^
   include/linux/cleanup.h:385:25: note: in definition of macro '__DEFINE_UNLOCK_GUARD'
     385 |         if (_T->lock) { _unlock; }                                      \
         |                         ^~~~~~~
   include/linux/irqflags.h:266:1: note: in expansion of macro 'DEFINE_LOCK_GUARD_0'
     266 | DEFINE_LOCK_GUARD_0(irqsave,
         | ^~~~~~~~~~~~~~~~~~~
   include/linux/irqflags.h:188:17: note: in expansion of macro 'typecheck'
     188 |                 typecheck(unsigned long, flags);        \
         |                 ^~~~~~~~~
   include/linux/irqflags.h:223:22: note: in expansion of macro 'raw_irqs_disabled_flags'
     223 |                 if (!raw_irqs_disabled_flags(flags))    \
         |                      ^~~~~~~~~~~~~~~~~~~~~~~
   include/linux/irqflags.h:268:21: note: in expansion of macro 'local_irq_restore'
     268 |                     local_irq_restore(_T->flags),
         |                     ^~~~~~~~~~~~~~~~~
   include/linux/typecheck.h:11:30: error: empty scalar initializer
      11 |         typeof(x) __dummy2 = {}; \
         |                              ^
   include/linux/cleanup.h:385:25: note: in definition of macro '__DEFINE_UNLOCK_GUARD'
     385 |         if (_T->lock) { _unlock; }                                      \
         |                         ^~~~~~~
   include/linux/irqflags.h:266:1: note: in expansion of macro 'DEFINE_LOCK_GUARD_0'
     266 | DEFINE_LOCK_GUARD_0(irqsave,
         | ^~~~~~~~~~~~~~~~~~~
   include/linux/irqflags.h:188:17: note: in expansion of macro 'typecheck'
     188 |                 typecheck(unsigned long, flags);        \
         |                 ^~~~~~~~~
   include/linux/irqflags.h:223:22: note: in expansion of macro 'raw_irqs_disabled_flags'
     223 |                 if (!raw_irqs_disabled_flags(flags))    \
         |                      ^~~~~~~~~~~~~~~~~~~~~~~
   include/linux/irqflags.h:268:21: note: in expansion of macro 'local_irq_restore'
     268 |                     local_irq_restore(_T->flags),
         |                     ^~~~~~~~~~~~~~~~~
   include/linux/typecheck.h:11:30: note: (near initialization for '__dummy2')
      11 |         typeof(x) __dummy2 = {}; \
         |                              ^
   include/linux/cleanup.h:385:25: note: in definition of macro '__DEFINE_UNLOCK_GUARD'
     385 |         if (_T->lock) { _unlock; }                                      \
         |                         ^~~~~~~
   include/linux/irqflags.h:266:1: note: in expansion of macro 'DEFINE_LOCK_GUARD_0'
     266 | DEFINE_LOCK_GUARD_0(irqsave,
         | ^~~~~~~~~~~~~~~~~~~
   include/linux/irqflags.h:188:17: note: in expansion of macro 'typecheck'
     188 |                 typecheck(unsigned long, flags);        \
         |                 ^~~~~~~~~
   include/linux/irqflags.h:223:22: note: in expansion of macro 'raw_irqs_disabled_flags'
     223 |                 if (!raw_irqs_disabled_flags(flags))    \
         |                      ^~~~~~~~~~~~~~~~~~~~~~~
   include/linux/irqflags.h:268:21: note: in expansion of macro 'local_irq_restore'
     268 |                     local_irq_restore(_T->flags),
         |                     ^~~~~~~~~~~~~~~~~
...
...
include/linux/typecheck.h:10:24: error: empty scalar initializer
10 | ({      type __dummy = {}; \
         |                        ^
   include/linux/cleanup.h:385:25: note: in definition of macro '__DEFINE_UNLOCK_GUARD'
     385 |         if (_T->lock) { _unlock; }                                      \
         |                         ^~~~~~~
   include/linux/irqflags.h:266:1: note: in expansion of macro 'DEFINE_LOCK_GUARD_0'
     266 | DEFINE_LOCK_GUARD_0(irqsave,
         | ^~~~~~~~~~~~~~~~~~~
   include/linux/irqflags.h:177:17: note: in expansion of macro 'typecheck'
     177 |                 typecheck(unsigned long, flags);        \
         |                 ^~~~~~~~~
   include/linux/irqflags.h:225:17: note: in expansion of macro 'raw_local_irq_restore'
     225 |                 raw_local_irq_restore(flags);           \
         |                 ^~~~~~~~~~~~~~~~~~~~~
   include/linux/irqflags.h:268:21: note: in expansion of macro 'local_irq_restore'
     268 |                     local_irq_restore(_T->flags),
         |                     ^~~~~~~~~~~~~~~~~
   include/linux/typecheck.h:10:24: note: (near initialization for '__dummy')
      10 | ({      type __dummy = {}; \
         |                        ^
   include/linux/cleanup.h:385:25: note: in definition of macro '__DEFINE_UNLOCK_GUARD'
     385 |         if (_T->lock) { _unlock; }                                      \
         |                         ^~~~~~~
   include/linux/irqflags.h:266:1: note: in expansion of macro 'DEFINE_LOCK_GUARD_0'
     266 | DEFINE_LOCK_GUARD_0(irqsave,
         | ^~~~~~~~~~~~~~~~~~~
   include/linux/irqflags.h:177:17: note: in expansion of macro 'typecheck'
     177 |                 typecheck(unsigned long, flags);        \
         |                 ^~~~~~~~~
   include/linux/irqflags.h:225:17: note: in expansion of macro 'raw_local_irq_restore'
     225 |                 raw_local_irq_restore(flags);           \
         |                 ^~~~~~~~~~~~~~~~~~~~~
   include/linux/irqflags.h:268:21: note: in expansion of macro 'local_irq_restore'
     268 |                     local_irq_restore(_T->flags),
         |                     ^~~~~~~~~~~~~~~~~
   include/linux/typecheck.h:11:30: error: empty scalar initializer
      11 |         typeof(x) __dummy2 = {}; \
         |                              ^
   include/linux/cleanup.h:385:25: note: in definition of macro '__DEFINE_UNLOCK_GUARD'
     385 |         if (_T->lock) { _unlock; }                                      \
         |                         ^~~~~~~
   include/linux/irqflags.h:266:1: note: in expansion of macro 'DEFINE_LOCK_GUARD_0'
     266 | DEFINE_LOCK_GUARD_0(irqsave,
         | ^~~~~~~~~~~~~~~~~~~
   include/linux/irqflags.h:177:17: note: in expansion of macro 'typecheck'
     177 |                 typecheck(unsigned long, flags);        \
         |                 ^~~~~~~~~
   include/linux/irqflags.h:225:17: note: in expansion of macro 'raw_local_irq_restore'
     225 |                 raw_local_irq_restore(flags);           \
         |                 ^~~~~~~~~~~~~~~~~~~~~
   include/linux/irqflags.h:268:21: note: in expansion of macro 'local_irq_restore'
     268 |                     local_irq_restore(_T->flags),
         |                     ^~~~~~~~~~~~~~~~~
   include/linux/typecheck.h:11:30: note: (near initialization for '__dummy2')
      11 |         typeof(x) __dummy2 = {}; \
         |                              ^
   include/linux/cleanup.h:385:25: note: in definition of macro '__DEFINE_UNLOCK_GUARD'
     385 |         if (_T->lock) { _unlock; }                                      \
         |                         ^~~~~~~
   include/linux/irqflags.h:266:1: note: in expansion of macro 'DEFINE_LOCK_GUARD_0'
     266 | DEFINE_LOCK_GUARD_0(irqsave,
         | ^~~~~~~~~~~~~~~~~~~
   include/linux/irqflags.h:177:17: note: in expansion of macro 'typecheck'
     177 |                 typecheck(unsigned long, flags);        \
         |                 ^~~~~~~~~
   include/linux/irqflags.h:225:17: note: in expansion of macro 'raw_local_irq_restore'
     225 |                 raw_local_irq_restore(flags);           \
         |                 ^~~~~~~~~~~~~~~~~~~~~
   include/linux/irqflags.h:268:21: note: in expansion of macro 'local_irq_restore'
     268 |                     local_irq_restore(_T->flags),
         |                     ^~~~~~~~~~~~~~~~~
   include/linux/irqflags.h: In function 'class_irqsave_constructor':
...
...
include/linux/typecheck.h:10:24: error: empty scalar initializer
10 | ({      type __dummy = {}; \
         |                        ^
   include/linux/cleanup.h:403:9: note: in definition of macro '__DEFINE_LOCK_GUARD_0'
     403 |         _lock;                                                          \
         |         ^~~~~
   include/linux/irqflags.h:266:1: note: in expansion of macro 'DEFINE_LOCK_GUARD_0'
     266 | DEFINE_LOCK_GUARD_0(irqsave,
         | ^~~~~~~~~~~~~~~~~~~
   include/linux/irqflags.h:172:17: note: in expansion of macro 'typecheck'
     172 |                 typecheck(unsigned long, flags);        \
         |                 ^~~~~~~~~
   include/linux/irqflags.h:216:17: note: in expansion of macro 'raw_local_irq_save'
     216 |                 raw_local_irq_save(flags);              \
         |                 ^~~~~~~~~~~~~~~~~~
   include/linux/irqflags.h:267:21: note: in expansion of macro 'local_irq_save'
     267 |                     local_irq_save(_T->flags),
         |                     ^~~~~~~~~~~~~~
   include/linux/typecheck.h:10:24: note: (near initialization for '__dummy')
      10 | ({      type __dummy = {}; \
         |                        ^
   include/linux/cleanup.h:403:9: note: in definition of macro '__DEFINE_LOCK_GUARD_0'
     403 |         _lock;                                                          \
         |         ^~~~~
   include/linux/irqflags.h:266:1: note: in expansion of macro 'DEFINE_LOCK_GUARD_0'
     266 | DEFINE_LOCK_GUARD_0(irqsave,
         | ^~~~~~~~~~~~~~~~~~~
   include/linux/irqflags.h:172:17: note: in expansion of macro 'typecheck'
     172 |                 typecheck(unsigned long, flags);        \
         |                 ^~~~~~~~~
   include/linux/irqflags.h:216:17: note: in expansion of macro 'raw_local_irq_save'
     216 |                 raw_local_irq_save(flags);              \
         |                 ^~~~~~~~~~~~~~~~~~
   include/linux/irqflags.h:267:21: note: in expansion of macro 'local_irq_save'
     267 |                     local_irq_save(_T->flags),
         |                     ^~~~~~~~~~~~~~
   include/linux/typecheck.h:11:30: error: empty scalar initializer
      11 |         typeof(x) __dummy2 = {}; \
         |                              ^
   include/linux/cleanup.h:403:9: note: in definition of macro '__DEFINE_LOCK_GUARD_0'
     403 |         _lock;                                                          \
         |         ^~~~~
   include/linux/irqflags.h:266:1: note: in expansion of macro 'DEFINE_LOCK_GUARD_0'
     266 | DEFINE_LOCK_GUARD_0(irqsave,
         | ^~~~~~~~~~~~~~~~~~~
   include/linux/irqflags.h:172:17: note: in expansion of macro 'typecheck'
     172 |                 typecheck(unsigned long, flags);        \
         |                 ^~~~~~~~~
   include/linux/irqflags.h:216:17: note: in expansion of macro 'raw_local_irq_save'
     216 |                 raw_local_irq_save(flags);              \
         |                 ^~~~~~~~~~~~~~~~~~
   include/linux/irqflags.h:267:21: note: in expansion of macro 'local_irq_save'
     267 |                     local_irq_save(_T->flags),
         |                     ^~~~~~~~~~~~~~
   include/linux/typecheck.h:11:30: note: (near initialization for '__dummy2')
      11 |         typeof(x) __dummy2 = {}; \
         |                              ^
   include/linux/cleanup.h:403:9: note: in definition of macro '__DEFINE_LOCK_GUARD_0'
     403 |         _lock;                                                          \
         |         ^~~~~
   include/linux/irqflags.h:266:1: note: in expansion of macro 'DEFINE_LOCK_GUARD_0'
     266 | DEFINE_LOCK_GUARD_0(irqsave,
         | ^~~~~~~~~~~~~~~~~~~
   include/linux/irqflags.h:172:17: note: in expansion of macro 'typecheck'
     172 |                 typecheck(unsigned long, flags);        \
         |                 ^~~~~~~~~
   include/linux/irqflags.h:216:17: note: in expansion of macro 'raw_local_irq_save'
     216 |                 raw_local_irq_save(flags);              \
         |                 ^~~~~~~~~~~~~~~~~~
   include/linux/irqflags.h:267:21: note: in expansion of macro 'local_irq_save'
     267 |                     local_irq_save(_T->flags),
         |                     ^~~~~~~~~~~~~~
...
...
include/linux/typecheck.h:10:24: error: empty scalar initializer
10 | ({      type __dummy = {}; \
         |                        ^
   include/linux/cleanup.h:403:9: note: in definition of macro '__DEFINE_LOCK_GUARD_0'
     403 |         _lock;                                                          \
         |         ^~~~~
   include/linux/irqflags.h:266:1: note: in expansion of macro 'DEFINE_LOCK_GUARD_0'
     266 | DEFINE_LOCK_GUARD_0(irqsave,
         | ^~~~~~~~~~~~~~~~~~~
   include/linux/irqflags.h:188:17: note: in expansion of macro 'typecheck'
     188 |                 typecheck(unsigned long, flags);        \
         |                 ^~~~~~~~~
   include/linux/irqflags.h:217:22: note: in expansion of macro 'raw_irqs_disabled_flags'
     217 |                 if (!raw_irqs_disabled_flags(flags))    \
         |                      ^~~~~~~~~~~~~~~~~~~~~~~
   include/linux/irqflags.h:267:21: note: in expansion of macro 'local_irq_save'
     267 |                     local_irq_save(_T->flags),
         |                     ^~~~~~~~~~~~~~
   include/linux/typecheck.h:10:24: note: (near initialization for '__dummy')
      10 | ({      type __dummy = {}; \
         |                        ^
   include/linux/cleanup.h:403:9: note: in definition of macro '__DEFINE_LOCK_GUARD_0'
     403 |         _lock;                                                          \
         |         ^~~~~
   include/linux/irqflags.h:266:1: note: in expansion of macro 'DEFINE_LOCK_GUARD_0'
     266 | DEFINE_LOCK_GUARD_0(irqsave,
         | ^~~~~~~~~~~~~~~~~~~
   include/linux/irqflags.h:188:17: note: in expansion of macro 'typecheck'
     188 |                 typecheck(unsigned long, flags);        \
         |                 ^~~~~~~~~
   include/linux/irqflags.h:217:22: note: in expansion of macro 'raw_irqs_disabled_flags'
     217 |                 if (!raw_irqs_disabled_flags(flags))    \
         |                      ^~~~~~~~~~~~~~~~~~~~~~~
   include/linux/irqflags.h:267:21: note: in expansion of macro 'local_irq_save'
     267 |                     local_irq_save(_T->flags),
         |                     ^~~~~~~~~~~~~~
   include/linux/typecheck.h:11:30: error: empty scalar initializer
      11 |         typeof(x) __dummy2 = {}; \
         |                              ^
   include/linux/cleanup.h:403:9: note: in definition of macro '__DEFINE_LOCK_GUARD_0'
     403 |         _lock;                                                          \
         |         ^~~~~
   include/linux/irqflags.h:266:1: note: in expansion of macro 'DEFINE_LOCK_GUARD_0'
     266 | DEFINE_LOCK_GUARD_0(irqsave,
         | ^~~~~~~~~~~~~~~~~~~
   include/linux/irqflags.h:188:17: note: in expansion of macro 'typecheck'
     188 |                 typecheck(unsigned long, flags);        \
         |                 ^~~~~~~~~
   include/linux/irqflags.h:217:22: note: in expansion of macro 'raw_irqs_disabled_flags'
     217 |                 if (!raw_irqs_disabled_flags(flags))    \
         |                      ^~~~~~~~~~~~~~~~~~~~~~~
   include/linux/irqflags.h:267:21: note: in expansion of macro 'local_irq_save'
     267 |                     local_irq_save(_T->flags),
         |                     ^~~~~~~~~~~~~~
   include/linux/typecheck.h:11:30: note: (near initialization for '__dummy2')
      11 |         typeof(x) __dummy2 = {}; \
         |                              ^
   include/linux/cleanup.h:403:9: note: in definition of macro '__DEFINE_LOCK_GUARD_0'
     403 |         _lock;                                                          \
         |         ^~~~~
   include/linux/irqflags.h:266:1: note: in expansion of macro 'DEFINE_LOCK_GUARD_0'
     266 | DEFINE_LOCK_GUARD_0(irqsave,
         | ^~~~~~~~~~~~~~~~~~~
   include/linux/irqflags.h:188:17: note: in expansion of macro 'typecheck'
     188 |                 typecheck(unsigned long, flags);        \
         |                 ^~~~~~~~~
   include/linux/irqflags.h:217:22: note: in expansion of macro 'raw_irqs_disabled_flags'
     217 |                 if (!raw_irqs_disabled_flags(flags))    \
         |                      ^~~~~~~~~~~~~~~~~~~~~~~
   include/linux/irqflags.h:267:21: note: in expansion of macro 'local_irq_save'
     267 |                     local_irq_save(_T->flags),
         |                     ^~~~~~~~~~~~~~
   In file included from include/linux/bitops.h:7,
                    from include/linux/thread_info.h:27,
                    from include/linux/sched.h:14:
   include/linux/spinlock_api_smp.h: In function '__raw_spin_lock_irqsave':
...
...
include/linux/typecheck.h:10:24: error: empty scalar initializer
10 | ({      type __dummy = {}; \
         |                        ^
   include/linux/irqflags.h:172:17: note: in expansion of macro 'typecheck'
     172 |                 typecheck(unsigned long, flags);        \
         |                 ^~~~~~~~~
   include/linux/irqflags.h:216:17: note: in expansion of macro 'raw_local_irq_save'
     216 |                 raw_local_irq_save(flags);              \
         |                 ^~~~~~~~~~~~~~~~~~
   include/linux/spinlock_api_smp.h:108:9: note: in expansion of macro 'local_irq_save'
     108 |         local_irq_save(flags);
         |         ^~~~~~~~~~~~~~
   include/linux/typecheck.h:10:24: note: (near initialization for '__dummy')
      10 | ({      type __dummy = {}; \
         |                        ^
   include/linux/irqflags.h:172:17: note: in expansion of macro 'typecheck'
     172 |                 typecheck(unsigned long, flags);        \
         |                 ^~~~~~~~~
   include/linux/irqflags.h:216:17: note: in expansion of macro 'raw_local_irq_save'
     216 |                 raw_local_irq_save(flags);              \
         |                 ^~~~~~~~~~~~~~~~~~
   include/linux/spinlock_api_smp.h:108:9: note: in expansion of macro 'local_irq_save'
     108 |         local_irq_save(flags);
         |         ^~~~~~~~~~~~~~
   include/linux/typecheck.h:11:30: error: empty scalar initializer
      11 |         typeof(x) __dummy2 = {}; \
         |                              ^
   include/linux/irqflags.h:172:17: note: in expansion of macro 'typecheck'
     172 |                 typecheck(unsigned long, flags);        \
         |                 ^~~~~~~~~
   include/linux/irqflags.h:216:17: note: in expansion of macro 'raw_local_irq_save'
     216 |                 raw_local_irq_save(flags);              \
         |                 ^~~~~~~~~~~~~~~~~~
   include/linux/spinlock_api_smp.h:108:9: note: in expansion of macro 'local_irq_save'
     108 |         local_irq_save(flags);
         |         ^~~~~~~~~~~~~~
   include/linux/typecheck.h:11:30: note: (near initialization for '__dummy2')
      11 |         typeof(x) __dummy2 = {}; \
         |                              ^
   include/linux/irqflags.h:172:17: note: in expansion of macro 'typecheck'
     172 |                 typecheck(unsigned long, flags);        \
         |                 ^~~~~~~~~
   include/linux/irqflags.h:216:17: note: in expansion of macro 'raw_local_irq_save'
     216 |                 raw_local_irq_save(flags);              \
         |                 ^~~~~~~~~~~~~~~~~~
   include/linux/spinlock_api_smp.h:108:9: note: in expansion of macro 'local_irq_save'
     108 |         local_irq_save(flags);
         |         ^~~~~~~~~~~~~~
...
...
include/linux/typecheck.h:10:24: error: empty scalar initializer
10 | ({      type __dummy = {}; \
         |                        ^
   include/linux/irqflags.h:188:17: note: in expansion of macro 'typecheck'
     188 |                 typecheck(unsigned long, flags);        \
         |                 ^~~~~~~~~
   include/linux/irqflags.h:217:22: note: in expansion of macro 'raw_irqs_disabled_flags'
     217 |                 if (!raw_irqs_disabled_flags(flags))    \
         |                      ^~~~~~~~~~~~~~~~~~~~~~~
   include/linux/spinlock_api_smp.h:108:9: note: in expansion of macro 'local_irq_save'
     108 |         local_irq_save(flags);
         |         ^~~~~~~~~~~~~~
   include/linux/typecheck.h:10:24: note: (near initialization for '__dummy')
      10 | ({      type __dummy = {}; \
         |                        ^
   include/linux/irqflags.h:188:17: note: in expansion of macro 'typecheck'
     188 |                 typecheck(unsigned long, flags);        \
         |                 ^~~~~~~~~
   include/linux/irqflags.h:217:22: note: in expansion of macro 'raw_irqs_disabled_flags'
     217 |                 if (!raw_irqs_disabled_flags(flags))    \
         |                      ^~~~~~~~~~~~~~~~~~~~~~~
   include/linux/spinlock_api_smp.h:108:9: note: in expansion of macro 'local_irq_save'
     108 |         local_irq_save(flags);
         |         ^~~~~~~~~~~~~~
   include/linux/typecheck.h:11:30: error: empty scalar initializer
      11 |         typeof(x) __dummy2 = {}; \
         |                              ^
   include/linux/irqflags.h:188:17: note: in expansion of macro 'typecheck'
     188 |                 typecheck(unsigned long, flags);        \
         |                 ^~~~~~~~~
   include/linux/irqflags.h:217:22: note: in expansion of macro 'raw_irqs_disabled_flags'
     217 |                 if (!raw_irqs_disabled_flags(flags))    \
         |                      ^~~~~~~~~~~~~~~~~~~~~~~
   include/linux/spinlock_api_smp.h:108:9: note: in expansion of macro 'local_irq_save'
     108 |         local_irq_save(flags);
         |         ^~~~~~~~~~~~~~
   include/linux/typecheck.h:11:30: note: (near initialization for '__dummy2')
      11 |         typeof(x) __dummy2 = {}; \
         |                              ^
   include/linux/irqflags.h:188:17: note: in expansion of macro 'typecheck'
     188 |                 typecheck(unsigned long, flags);        \
         |                 ^~~~~~~~~
   include/linux/irqflags.h:217:22: note: in expansion of macro 'raw_irqs_disabled_flags'
     217 |                 if (!raw_irqs_disabled_flags(flags))    \
         |                      ^~~~~~~~~~~~~~~~~~~~~~~
   include/linux/spinlock_api_smp.h:108:9: note: in expansion of macro 'local_irq_save'
     108 |         local_irq_save(flags);
         |         ^~~~~~~~~~~~~~
   include/linux/spinlock_api_smp.h: In function '__raw_spin_unlock_irqrestore':
...
...
include/linux/typecheck.h:10:24: error: empty scalar initializer
10 | ({      type __dummy = {}; \
         |                        ^
   include/linux/irqflags.h:188:17: note: in expansion of macro 'typecheck'
     188 |                 typecheck(unsigned long, flags);        \
         |                 ^~~~~~~~~
   include/linux/irqflags.h:223:22: note: in expansion of macro 'raw_irqs_disabled_flags'
     223 |                 if (!raw_irqs_disabled_flags(flags))    \
         |                      ^~~~~~~~~~~~~~~~~~~~~~~
   include/linux/spinlock_api_smp.h:151:9: note: in expansion of macro 'local_irq_restore'
     151 |         local_irq_restore(flags);
         |         ^~~~~~~~~~~~~~~~~
   include/linux/typecheck.h:10:24: note: (near initialization for '__dummy')
      10 | ({      type __dummy = {}; \
         |                        ^
   include/linux/irqflags.h:188:17: note: in expansion of macro 'typecheck'
     188 |                 typecheck(unsigned long, flags);        \
         |                 ^~~~~~~~~
   include/linux/irqflags.h:223:22: note: in expansion of macro 'raw_irqs_disabled_flags'
     223 |                 if (!raw_irqs_disabled_flags(flags))    \
         |                      ^~~~~~~~~~~~~~~~~~~~~~~
   include/linux/spinlock_api_smp.h:151:9: note: in expansion of macro 'local_irq_restore'
     151 |         local_irq_restore(flags);
         |         ^~~~~~~~~~~~~~~~~
   include/linux/typecheck.h:11:30: error: empty scalar initializer
      11 |         typeof(x) __dummy2 = {}; \
         |                              ^
   include/linux/irqflags.h:188:17: note: in expansion of macro 'typecheck'
     188 |                 typecheck(unsigned long, flags);        \
         |                 ^~~~~~~~~
   include/linux/irqflags.h:223:22: note: in expansion of macro 'raw_irqs_disabled_flags'
     223 |                 if (!raw_irqs_disabled_flags(flags))    \
         |                      ^~~~~~~~~~~~~~~~~~~~~~~
   include/linux/spinlock_api_smp.h:151:9: note: in expansion of macro 'local_irq_restore'
     151 |         local_irq_restore(flags);
         |         ^~~~~~~~~~~~~~~~~
   include/linux/typecheck.h:11:30: note: (near initialization for '__dummy2')
      11 |         typeof(x) __dummy2 = {}; \
         |                              ^
   include/linux/irqflags.h:188:17: note: in expansion of macro 'typecheck'
     188 |                 typecheck(unsigned long, flags);        \
         |                 ^~~~~~~~~
   include/linux/irqflags.h:223:22: note: in expansion of macro 'raw_irqs_disabled_flags'
     223 |                 if (!raw_irqs_disabled_flags(flags))    \
         |                      ^~~~~~~~~~~~~~~~~~~~~~~
   include/linux/spinlock_api_smp.h:151:9: note: in expansion of macro 'local_irq_restore'
     151 |         local_irq_restore(flags);
         |         ^~~~~~~~~~~~~~~~~
...
...
include/linux/typecheck.h:10:24: error: empty scalar initializer
10 | ({      type __dummy = {}; \
         |                        ^
   include/linux/irqflags.h:177:17: note: in expansion of macro 'typecheck'
     177 |                 typecheck(unsigned long, flags);        \
         |                 ^~~~~~~~~
   include/linux/irqflags.h:225:17: note: in expansion of macro 'raw_local_irq_restore'
     225 |                 raw_local_irq_restore(flags);           \
         |                 ^~~~~~~~~~~~~~~~~~~~~
   include/linux/spinlock_api_smp.h:151:9: note: in expansion of macro 'local_irq_restore'
     151 |         local_irq_restore(flags);
         |         ^~~~~~~~~~~~~~~~~
   include/linux/typecheck.h:10:24: note: (near initialization for '__dummy')
      10 | ({      type __dummy = {}; \
         |                        ^
   include/linux/irqflags.h:177:17: note: in expansion of macro 'typecheck'
     177 |                 typecheck(unsigned long, flags);        \
         |                 ^~~~~~~~~
   include/linux/irqflags.h:225:17: note: in expansion of macro 'raw_local_irq_restore'
     225 |                 raw_local_irq_restore(flags);           \
         |                 ^~~~~~~~~~~~~~~~~~~~~
   include/linux/spinlock_api_smp.h:151:9: note: in expansion of macro 'local_irq_restore'
     151 |         local_irq_restore(flags);
         |         ^~~~~~~~~~~~~~~~~
   include/linux/typecheck.h:11:30: error: empty scalar initializer
      11 |         typeof(x) __dummy2 = {}; \
         |                              ^
   include/linux/irqflags.h:177:17: note: in expansion of macro 'typecheck'
     177 |                 typecheck(unsigned long, flags);        \
         |                 ^~~~~~~~~
   include/linux/irqflags.h:225:17: note: in expansion of macro 'raw_local_irq_restore'
     225 |                 raw_local_irq_restore(flags);           \
         |                 ^~~~~~~~~~~~~~~~~~~~~
   include/linux/spinlock_api_smp.h:151:9: note: in expansion of macro 'local_irq_restore'
     151 |         local_irq_restore(flags);
         |         ^~~~~~~~~~~~~~~~~
   include/linux/typecheck.h:11:30: note: (near initialization for '__dummy2')
      11 |         typeof(x) __dummy2 = {}; \
         |                              ^
   include/linux/irqflags.h:177:17: note: in expansion of macro 'typecheck'
     177 |                 typecheck(unsigned long, flags);        \
         |                 ^~~~~~~~~
   include/linux/irqflags.h:225:17: note: in expansion of macro 'raw_local_irq_restore'
     225 |                 raw_local_irq_restore(flags);           \
         |                 ^~~~~~~~~~~~~~~~~~~~~
   include/linux/spinlock_api_smp.h:151:9: note: in expansion of macro 'local_irq_restore'
     151 |         local_irq_restore(flags);
         |         ^~~~~~~~~~~~~~~~~
   include/linux/rwlock_api_smp.h: In function '__raw_read_lock_irqsave':
...
...
include/linux/typecheck.h:10:24: error: empty scalar initializer
10 | ({      type __dummy = {}; \
         |                        ^
   include/linux/irqflags.h:172:17: note: in expansion of macro 'typecheck'
     172 |                 typecheck(unsigned long, flags);        \
         |                 ^~~~~~~~~
   include/linux/irqflags.h:216:17: note: in expansion of macro 'raw_local_irq_save'
     216 |                 raw_local_irq_save(flags);              \
         |                 ^~~~~~~~~~~~~~~~~~
   include/linux/rwlock_api_smp.h:158:9: note: in expansion of macro 'local_irq_save'
     158 |         local_irq_save(flags);
         |         ^~~~~~~~~~~~~~
   include/linux/typecheck.h:10:24: note: (near initialization for '__dummy')
      10 | ({      type __dummy = {}; \
         |                        ^
   include/linux/irqflags.h:172:17: note: in expansion of macro 'typecheck'
     172 |                 typecheck(unsigned long, flags);        \
         |                 ^~~~~~~~~
   include/linux/irqflags.h:216:17: note: in expansion of macro 'raw_local_irq_save'
     216 |                 raw_local_irq_save(flags);              \
         |                 ^~~~~~~~~~~~~~~~~~
   include/linux/rwlock_api_smp.h:158:9: note: in expansion of macro 'local_irq_save'
     158 |         local_irq_save(flags);
         |         ^~~~~~~~~~~~~~
   include/linux/typecheck.h:11:30: error: empty scalar initializer
      11 |         typeof(x) __dummy2 = {}; \
         |                              ^
   include/linux/irqflags.h:172:17: note: in expansion of macro 'typecheck'
     172 |                 typecheck(unsigned long, flags);        \
         |                 ^~~~~~~~~
   include/linux/irqflags.h:216:17: note: in expansion of macro 'raw_local_irq_save'
     216 |                 raw_local_irq_save(flags);              \
         |                 ^~~~~~~~~~~~~~~~~~
   include/linux/rwlock_api_smp.h:158:9: note: in expansion of macro 'local_irq_save'
     158 |         local_irq_save(flags);
         |         ^~~~~~~~~~~~~~
   include/linux/typecheck.h:11:30: note: (near initialization for '__dummy2')
      11 |         typeof(x) __dummy2 = {}; \
         |                              ^
   include/linux/irqflags.h:172:17: note: in expansion of macro 'typecheck'
     172 |                 typecheck(unsigned long, flags);        \
         |                 ^~~~~~~~~
   include/linux/irqflags.h:216:17: note: in expansion of macro 'raw_local_irq_save'
     216 |                 raw_local_irq_save(flags);              \
         |                 ^~~~~~~~~~~~~~~~~~
   include/linux/rwlock_api_smp.h:158:9: note: in expansion of macro 'local_irq_save'
     158 |         local_irq_save(flags);
         |         ^~~~~~~~~~~~~~
...
...
include/linux/typecheck.h:10:24: error: empty scalar initializer
10 | ({      type __dummy = {}; \
         |                        ^
   include/linux/irqflags.h:188:17: note: in expansion of macro 'typecheck'
     188 |                 typecheck(unsigned long, flags);        \
         |                 ^~~~~~~~~
   include/linux/irqflags.h:217:22: note: in expansion of macro 'raw_irqs_disabled_flags'
     217 |                 if (!raw_irqs_disabled_flags(flags))    \
         |                      ^~~~~~~~~~~~~~~~~~~~~~~
   include/linux/rwlock_api_smp.h:158:9: note: in expansion of macro 'local_irq_save'
     158 |         local_irq_save(flags);
         |         ^~~~~~~~~~~~~~
   include/linux/typecheck.h:10:24: note: (near initialization for '__dummy')
      10 | ({      type __dummy = {}; \
         |                        ^
   include/linux/irqflags.h:188:17: note: in expansion of macro 'typecheck'
     188 |                 typecheck(unsigned long, flags);        \
         |                 ^~~~~~~~~
   include/linux/irqflags.h:217:22: note: in expansion of macro 'raw_irqs_disabled_flags'
     217 |                 if (!raw_irqs_disabled_flags(flags))    \
         |                      ^~~~~~~~~~~~~~~~~~~~~~~
   include/linux/rwlock_api_smp.h:158:9: note: in expansion of macro 'local_irq_save'
     158 |         local_irq_save(flags);
         |         ^~~~~~~~~~~~~~
   include/linux/typecheck.h:11:30: error: empty scalar initializer
      11 |         typeof(x) __dummy2 = {}; \
         |                              ^
   include/linux/irqflags.h:188:17: note: in expansion of macro 'typecheck'
     188 |                 typecheck(unsigned long, flags);        \
         |                 ^~~~~~~~~
   include/linux/irqflags.h:217:22: note: in expansion of macro 'raw_irqs_disabled_flags'
     217 |                 if (!raw_irqs_disabled_flags(flags))    \
         |                      ^~~~~~~~~~~~~~~~~~~~~~~
   include/linux/rwlock_api_smp.h:158:9: note: in expansion of macro 'local_irq_save'
     158 |         local_irq_save(flags);
         |         ^~~~~~~~~~~~~~
   include/linux/typecheck.h:11:30: note: (near initialization for '__dummy2')
      11 |         typeof(x) __dummy2 = {}; \
         |                              ^
   include/linux/irqflags.h:188:17: note: in expansion of macro 'typecheck'
     188 |                 typecheck(unsigned long, flags);        \
         |                 ^~~~~~~~~
   include/linux/irqflags.h:217:22: note: in expansion of macro 'raw_irqs_disabled_flags'
     217 |                 if (!raw_irqs_disabled_flags(flags))    \
         |                      ^~~~~~~~~~~~~~~~~~~~~~~
   include/linux/rwlock_api_smp.h:158:9: note: in expansion of macro 'local_irq_save'
     158 |         local_irq_save(flags);
         |         ^~~~~~~~~~~~~~
   include/linux/rwlock_api_smp.h: In function '__raw_write_lock_irqsave':
...
...
include/linux/typecheck.h:10:24: error: empty scalar initializer
10 | ({      type __dummy = {}; \
         |                        ^
   include/linux/irqflags.h:172:17: note: in expansion of macro 'typecheck'
     172 |                 typecheck(unsigned long, flags);        \
         |                 ^~~~~~~~~
   include/linux/irqflags.h:216:17: note: in expansion of macro 'raw_local_irq_save'
     216 |                 raw_local_irq_save(flags);              \
         |                 ^~~~~~~~~~~~~~~~~~
   include/linux/rwlock_api_smp.h:184:9: note: in expansion of macro 'local_irq_save'
     184 |         local_irq_save(flags);
         |         ^~~~~~~~~~~~~~
   include/linux/typecheck.h:10:24: note: (near initialization for '__dummy')
      10 | ({      type __dummy = {}; \
         |                        ^
   include/linux/irqflags.h:172:17: note: in expansion of macro 'typecheck'
     172 |                 typecheck(unsigned long, flags);        \
         |                 ^~~~~~~~~
   include/linux/irqflags.h:216:17: note: in expansion of macro 'raw_local_irq_save'
     216 |                 raw_local_irq_save(flags);              \
         |                 ^~~~~~~~~~~~~~~~~~
   include/linux/rwlock_api_smp.h:184:9: note: in expansion of macro 'local_irq_save'
     184 |         local_irq_save(flags);
         |         ^~~~~~~~~~~~~~
   include/linux/typecheck.h:11:30: error: empty scalar initializer
      11 |         typeof(x) __dummy2 = {}; \
         |                              ^
   include/linux/irqflags.h:172:17: note: in expansion of macro 'typecheck'
     172 |                 typecheck(unsigned long, flags);        \
         |                 ^~~~~~~~~
   include/linux/irqflags.h:216:17: note: in expansion of macro 'raw_local_irq_save'
     216 |                 raw_local_irq_save(flags);              \
         |                 ^~~~~~~~~~~~~~~~~~
   include/linux/rwlock_api_smp.h:184:9: note: in expansion of macro 'local_irq_save'
     184 |         local_irq_save(flags);
         |         ^~~~~~~~~~~~~~
   include/linux/typecheck.h:11:30: note: (near initialization for '__dummy2')
      11 |         typeof(x) __dummy2 = {}; \
         |                              ^
   include/linux/irqflags.h:172:17: note: in expansion of macro 'typecheck'
     172 |                 typecheck(unsigned long, flags);        \
         |                 ^~~~~~~~~
   include/linux/irqflags.h:216:17: note: in expansion of macro 'raw_local_irq_save'
     216 |                 raw_local_irq_save(flags);              \
         |                 ^~~~~~~~~~~~~~~~~~
   include/linux/rwlock_api_smp.h:184:9: note: in expansion of macro 'local_irq_save'
     184 |         local_irq_save(flags);
         |         ^~~~~~~~~~~~~~
...
...
include/linux/typecheck.h:10:24: error: empty scalar initializer
10 | ({      type __dummy = {}; \
         |                        ^
   include/linux/irqflags.h:188:17: note: in expansion of macro 'typecheck'
     188 |                 typecheck(unsigned long, flags);        \
         |                 ^~~~~~~~~
   include/linux/irqflags.h:217:22: note: in expansion of macro 'raw_irqs_disabled_flags'
     217 |                 if (!raw_irqs_disabled_flags(flags))    \
         |                      ^~~~~~~~~~~~~~~~~~~~~~~
   include/linux/rwlock_api_smp.h:184:9: note: in expansion of macro 'local_irq_save'
     184 |         local_irq_save(flags);
         |         ^~~~~~~~~~~~~~
   include/linux/typecheck.h:10:24: note: (near initialization for '__dummy')
      10 | ({      type __dummy = {}; \
         |                        ^
   include/linux/irqflags.h:188:17: note: in expansion of macro 'typecheck'
     188 |                 typecheck(unsigned long, flags);        \
         |                 ^~~~~~~~~
   include/linux/irqflags.h:217:22: note: in expansion of macro 'raw_irqs_disabled_flags'
     217 |                 if (!raw_irqs_disabled_flags(flags))    \
         |                      ^~~~~~~~~~~~~~~~~~~~~~~
   include/linux/rwlock_api_smp.h:184:9: note: in expansion of macro 'local_irq_save'
     184 |         local_irq_save(flags);
         |         ^~~~~~~~~~~~~~
   include/linux/typecheck.h:11:30: error: empty scalar initializer
      11 |         typeof(x) __dummy2 = {}; \
         |                              ^
   include/linux/irqflags.h:188:17: note: in expansion of macro 'typecheck'
     188 |                 typecheck(unsigned long, flags);        \
         |                 ^~~~~~~~~
   include/linux/irqflags.h:217:22: note: in expansion of macro 'raw_irqs_disabled_flags'
     217 |                 if (!raw_irqs_disabled_flags(flags))    \
         |                      ^~~~~~~~~~~~~~~~~~~~~~~
   include/linux/rwlock_api_smp.h:184:9: note: in expansion of macro 'local_irq_save'
     184 |         local_irq_save(flags);
         |         ^~~~~~~~~~~~~~
   include/linux/typecheck.h:11:30: note: (near initialization for '__dummy2')
      11 |         typeof(x) __dummy2 = {}; \
         |                              ^
   include/linux/irqflags.h:188:17: note: in expansion of macro 'typecheck'
     188 |                 typecheck(unsigned long, flags);        \
         |                 ^~~~~~~~~
   include/linux/irqflags.h:217:22: note: in expansion of macro 'raw_irqs_disabled_flags'
     217 |                 if (!raw_irqs_disabled_flags(flags))    \
         |                      ^~~~~~~~~~~~~~~~~~~~~~~
   include/linux/rwlock_api_smp.h:184:9: note: in expansion of macro 'local_irq_save'
     184 |         local_irq_save(flags);
         |         ^~~~~~~~~~~~~~
   include/linux/rwlock_api_smp.h: In function '__raw_read_unlock_irqrestore':
...
...
include/linux/typecheck.h:10:24: error: empty scalar initializer
10 | ({      type __dummy = {}; \
         |                        ^
   include/linux/irqflags.h:188:17: note: in expansion of macro 'typecheck'
     188 |                 typecheck(unsigned long, flags);        \
         |                 ^~~~~~~~~
   include/linux/irqflags.h:223:22: note: in expansion of macro 'raw_irqs_disabled_flags'
     223 |                 if (!raw_irqs_disabled_flags(flags))    \
         |                      ^~~~~~~~~~~~~~~~~~~~~~~
   include/linux/rwlock_api_smp.h:241:9: note: in expansion of macro 'local_irq_restore'
     241 |         local_irq_restore(flags);
         |         ^~~~~~~~~~~~~~~~~
   include/linux/typecheck.h:10:24: note: (near initialization for '__dummy')
      10 | ({      type __dummy = {}; \
         |                        ^
   include/linux/irqflags.h:188:17: note: in expansion of macro 'typecheck'
     188 |                 typecheck(unsigned long, flags);        \
         |                 ^~~~~~~~~
   include/linux/irqflags.h:223:22: note: in expansion of macro 'raw_irqs_disabled_flags'
     223 |                 if (!raw_irqs_disabled_flags(flags))    \
         |                      ^~~~~~~~~~~~~~~~~~~~~~~
   include/linux/rwlock_api_smp.h:241:9: note: in expansion of macro 'local_irq_restore'
     241 |         local_irq_restore(flags);
         |         ^~~~~~~~~~~~~~~~~
   include/linux/typecheck.h:11:30: error: empty scalar initializer
      11 |         typeof(x) __dummy2 = {}; \
         |                              ^
   include/linux/irqflags.h:188:17: note: in expansion of macro 'typecheck'
     188 |                 typecheck(unsigned long, flags);        \
         |                 ^~~~~~~~~
   include/linux/irqflags.h:223:22: note: in expansion of macro 'raw_irqs_disabled_flags'
     223 |                 if (!raw_irqs_disabled_flags(flags))    \
         |                      ^~~~~~~~~~~~~~~~~~~~~~~
   include/linux/rwlock_api_smp.h:241:9: note: in expansion of macro 'local_irq_restore'
     241 |         local_irq_restore(flags);
         |         ^~~~~~~~~~~~~~~~~
   include/linux/typecheck.h:11:30: note: (near initialization for '__dummy2')
      11 |         typeof(x) __dummy2 = {}; \
         |                              ^
   include/linux/irqflags.h:188:17: note: in expansion of macro 'typecheck'
     188 |                 typecheck(unsigned long, flags);        \
         |                 ^~~~~~~~~
   include/linux/irqflags.h:223:22: note: in expansion of macro 'raw_irqs_disabled_flags'
     223 |                 if (!raw_irqs_disabled_flags(flags))    \
         |                      ^~~~~~~~~~~~~~~~~~~~~~~
   include/linux/rwlock_api_smp.h:241:9: note: in expansion of macro 'local_irq_restore'
     241 |         local_irq_restore(flags);
         |         ^~~~~~~~~~~~~~~~~
...
...
include/linux/typecheck.h:10:24: error: empty scalar initializer
10 | ({      type __dummy = {}; \
         |                        ^
   include/linux/irqflags.h:177:17: note: in expansion of macro 'typecheck'
     177 |                 typecheck(unsigned long, flags);        \
         |                 ^~~~~~~~~
   include/linux/irqflags.h:225:17: note: in expansion of macro 'raw_local_irq_restore'
     225 |                 raw_local_irq_restore(flags);           \
         |                 ^~~~~~~~~~~~~~~~~~~~~
   include/linux/rwlock_api_smp.h:241:9: note: in expansion of macro 'local_irq_restore'
     241 |         local_irq_restore(flags);
         |         ^~~~~~~~~~~~~~~~~
   include/linux/typecheck.h:10:24: note: (near initialization for '__dummy')
      10 | ({      type __dummy = {}; \
         |                        ^
   include/linux/irqflags.h:177:17: note: in expansion of macro 'typecheck'
     177 |                 typecheck(unsigned long, flags);        \
         |                 ^~~~~~~~~
   include/linux/irqflags.h:225:17: note: in expansion of macro 'raw_local_irq_restore'
     225 |                 raw_local_irq_restore(flags);           \
         |                 ^~~~~~~~~~~~~~~~~~~~~
   include/linux/rwlock_api_smp.h:241:9: note: in expansion of macro 'local_irq_restore'
     241 |         local_irq_restore(flags);
         |         ^~~~~~~~~~~~~~~~~
   include/linux/typecheck.h:11:30: error: empty scalar initializer
      11 |         typeof(x) __dummy2 = {}; \
         |                              ^
   include/linux/irqflags.h:177:17: note: in expansion of macro 'typecheck'
     177 |                 typecheck(unsigned long, flags);        \
         |                 ^~~~~~~~~
   include/linux/irqflags.h:225:17: note: in expansion of macro 'raw_local_irq_restore'
     225 |                 raw_local_irq_restore(flags);           \
         |                 ^~~~~~~~~~~~~~~~~~~~~
   include/linux/rwlock_api_smp.h:241:9: note: in expansion of macro 'local_irq_restore'
     241 |         local_irq_restore(flags);
         |         ^~~~~~~~~~~~~~~~~
   include/linux/typecheck.h:11:30: note: (near initialization for '__dummy2')
      11 |         typeof(x) __dummy2 = {}; \
         |                              ^
   include/linux/irqflags.h:177:17: note: in expansion of macro 'typecheck'
     177 |                 typecheck(unsigned long, flags);        \
         |                 ^~~~~~~~~
   include/linux/irqflags.h:225:17: note: in expansion of macro 'raw_local_irq_restore'
     225 |                 raw_local_irq_restore(flags);           \
         |                 ^~~~~~~~~~~~~~~~~~~~~
   include/linux/rwlock_api_smp.h:241:9: note: in expansion of macro 'local_irq_restore'
     241 |         local_irq_restore(flags);
         |         ^~~~~~~~~~~~~~~~~
   include/linux/rwlock_api_smp.h: In function '__raw_write_unlock_irqrestore':
...
...
include/linux/typecheck.h:10:24: error: empty scalar initializer
10 | ({      type __dummy = {}; \
         |                        ^
   include/linux/irqflags.h:188:17: note: in expansion of macro 'typecheck'
     188 |                 typecheck(unsigned long, flags);        \
         |                 ^~~~~~~~~
   include/linux/irqflags.h:223:22: note: in expansion of macro 'raw_irqs_disabled_flags'
     223 |                 if (!raw_irqs_disabled_flags(flags))    \
         |                      ^~~~~~~~~~~~~~~~~~~~~~~
   include/linux/rwlock_api_smp.h:265:9: note: in expansion of macro 'local_irq_restore'
     265 |         local_irq_restore(flags);
         |         ^~~~~~~~~~~~~~~~~
   include/linux/typecheck.h:10:24: note: (near initialization for '__dummy')
      10 | ({      type __dummy = {}; \
         |                        ^
   include/linux/irqflags.h:188:17: note: in expansion of macro 'typecheck'
     188 |                 typecheck(unsigned long, flags);        \
         |                 ^~~~~~~~~
   include/linux/irqflags.h:223:22: note: in expansion of macro 'raw_irqs_disabled_flags'
     223 |                 if (!raw_irqs_disabled_flags(flags))    \
         |                      ^~~~~~~~~~~~~~~~~~~~~~~
   include/linux/rwlock_api_smp.h:265:9: note: in expansion of macro 'local_irq_restore'
     265 |         local_irq_restore(flags);
         |         ^~~~~~~~~~~~~~~~~
   include/linux/typecheck.h:11:30: error: empty scalar initializer
      11 |         typeof(x) __dummy2 = {}; \
         |                              ^
   include/linux/irqflags.h:188:17: note: in expansion of macro 'typecheck'
     188 |                 typecheck(unsigned long, flags);        \
         |                 ^~~~~~~~~
   include/linux/irqflags.h:223:22: note: in expansion of macro 'raw_irqs_disabled_flags'
     223 |                 if (!raw_irqs_disabled_flags(flags))    \
         |                      ^~~~~~~~~~~~~~~~~~~~~~~
   include/linux/rwlock_api_smp.h:265:9: note: in expansion of macro 'local_irq_restore'
     265 |         local_irq_restore(flags);
         |         ^~~~~~~~~~~~~~~~~
   include/linux/typecheck.h:11:30: note: (near initialization for '__dummy2')
      11 |         typeof(x) __dummy2 = {}; \
         |                              ^
   include/linux/irqflags.h:188:17: note: in expansion of macro 'typecheck'
     188 |                 typecheck(unsigned long, flags);        \
         |                 ^~~~~~~~~
   include/linux/irqflags.h:223:22: note: in expansion of macro 'raw_irqs_disabled_flags'
     223 |                 if (!raw_irqs_disabled_flags(flags))    \
         |                      ^~~~~~~~~~~~~~~~~~~~~~~
   include/linux/rwlock_api_smp.h:265:9: note: in expansion of macro 'local_irq_restore'
     265 |         local_irq_restore(flags);
         |         ^~~~~~~~~~~~~~~~~
...
...
include/linux/typecheck.h:10:24: error: empty scalar initializer
10 | ({      type __dummy = {}; \
         |                        ^
   include/linux/irqflags.h:177:17: note: in expansion of macro 'typecheck'
     177 |                 typecheck(unsigned long, flags);        \
         |                 ^~~~~~~~~
   include/linux/irqflags.h:225:17: note: in expansion of macro 'raw_local_irq_restore'
     225 |                 raw_local_irq_restore(flags);           \
         |                 ^~~~~~~~~~~~~~~~~~~~~
   include/linux/rwlock_api_smp.h:265:9: note: in expansion of macro 'local_irq_restore'
     265 |         local_irq_restore(flags);
         |         ^~~~~~~~~~~~~~~~~
   include/linux/typecheck.h:10:24: note: (near initialization for '__dummy')
      10 | ({      type __dummy = {}; \
         |                        ^
   include/linux/irqflags.h:177:17: note: in expansion of macro 'typecheck'
     177 |                 typecheck(unsigned long, flags);        \
         |                 ^~~~~~~~~
   include/linux/irqflags.h:225:17: note: in expansion of macro 'raw_local_irq_restore'
     225 |                 raw_local_irq_restore(flags);           \
         |                 ^~~~~~~~~~~~~~~~~~~~~
   include/linux/rwlock_api_smp.h:265:9: note: in expansion of macro 'local_irq_restore'
     265 |         local_irq_restore(flags);
         |         ^~~~~~~~~~~~~~~~~
   include/linux/typecheck.h:11:30: error: empty scalar initializer
      11 |         typeof(x) __dummy2 = {}; \
         |                              ^
   include/linux/irqflags.h:177:17: note: in expansion of macro 'typecheck'
     177 |                 typecheck(unsigned long, flags);        \
         |                 ^~~~~~~~~
   include/linux/irqflags.h:225:17: note: in expansion of macro 'raw_local_irq_restore'
     225 |                 raw_local_irq_restore(flags);           \
         |                 ^~~~~~~~~~~~~~~~~~~~~
   include/linux/rwlock_api_smp.h:265:9: note: in expansion of macro 'local_irq_restore'
     265 |         local_irq_restore(flags);
         |         ^~~~~~~~~~~~~~~~~
   include/linux/typecheck.h:11:30: note: (near initialization for '__dummy2')
      11 |         typeof(x) __dummy2 = {}; \
         |                              ^
   include/linux/irqflags.h:177:17: note: in expansion of macro 'typecheck'
     177 |                 typecheck(unsigned long, flags);        \
         |                 ^~~~~~~~~
   include/linux/irqflags.h:225:17: note: in expansion of macro 'raw_local_irq_restore'
     225 |                 raw_local_irq_restore(flags);           \
         |                 ^~~~~~~~~~~~~~~~~~~~~
   include/linux/rwlock_api_smp.h:265:9: note: in expansion of macro 'local_irq_restore'
     265 |         local_irq_restore(flags);
         |         ^~~~~~~~~~~~~~~~~
   include/linux/spinlock.h: In function 'spin_unlock_irqrestore':
...
...
include/linux/typecheck.h:10:24: error: empty scalar initializer
10 | ({      type __dummy = {}; \
         |                        ^
   include/linux/spinlock.h:281:17: note: in expansion of macro 'typecheck'
     281 |                 typecheck(unsigned long, flags);                \
         |                 ^~~~~~~~~
   include/linux/spinlock.h:406:9: note: in expansion of macro 'raw_spin_unlock_irqrestore'
     406 |         raw_spin_unlock_irqrestore(&lock->rlock, flags);
         |         ^~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/typecheck.h:10:24: note: (near initialization for '__dummy')
      10 | ({      type __dummy = {}; \
         |                        ^
   include/linux/spinlock.h:281:17: note: in expansion of macro 'typecheck'
     281 |                 typecheck(unsigned long, flags);                \
         |                 ^~~~~~~~~
   include/linux/spinlock.h:406:9: note: in expansion of macro 'raw_spin_unlock_irqrestore'
     406 |         raw_spin_unlock_irqrestore(&lock->rlock, flags);
         |         ^~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/typecheck.h:11:30: error: empty scalar initializer
      11 |         typeof(x) __dummy2 = {}; \
         |                              ^
   include/linux/spinlock.h:281:17: note: in expansion of macro 'typecheck'
     281 |                 typecheck(unsigned long, flags);                \
         |                 ^~~~~~~~~
   include/linux/spinlock.h:406:9: note: in expansion of macro 'raw_spin_unlock_irqrestore'
     406 |         raw_spin_unlock_irqrestore(&lock->rlock, flags);
         |         ^~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/typecheck.h:11:30: note: (near initialization for '__dummy2')
      11 |         typeof(x) __dummy2 = {}; \
         |                              ^
   include/linux/spinlock.h:281:17: note: in expansion of macro 'typecheck'
     281 |                 typecheck(unsigned long, flags);                \
         |                 ^~~~~~~~~
   include/linux/spinlock.h:406:9: note: in expansion of macro 'raw_spin_unlock_irqrestore'
     406 |         raw_spin_unlock_irqrestore(&lock->rlock, flags);
         |         ^~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/spinlock.h: In function 'class_raw_spinlock_irqsave_destructor':
...
...
include/linux/typecheck.h:10:24: error: empty scalar initializer
10 | ({      type __dummy = {}; \
         |                        ^
   include/linux/cleanup.h:385:25: note: in definition of macro '__DEFINE_UNLOCK_GUARD'
     385 |         if (_T->lock) { _unlock; }                                      \
         |                         ^~~~~~~
   include/linux/spinlock.h:557:1: note: in expansion of macro 'DEFINE_LOCK_GUARD_1'
     557 | DEFINE_LOCK_GUARD_1(raw_spinlock_irqsave, raw_spinlock_t,
         | ^~~~~~~~~~~~~~~~~~~
   include/linux/spinlock.h:281:17: note: in expansion of macro 'typecheck'
     281 |                 typecheck(unsigned long, flags);                \
         |                 ^~~~~~~~~
   include/linux/spinlock.h:559:21: note: in expansion of macro 'raw_spin_unlock_irqrestore'
     559 |                     raw_spin_unlock_irqrestore(_T->lock, _T->flags),
         |                     ^~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/typecheck.h:10:24: note: (near initialization for '__dummy')
      10 | ({      type __dummy = {}; \
         |                        ^
   include/linux/cleanup.h:385:25: note: in definition of macro '__DEFINE_UNLOCK_GUARD'
     385 |         if (_T->lock) { _unlock; }                                      \
         |                         ^~~~~~~
   include/linux/spinlock.h:557:1: note: in expansion of macro 'DEFINE_LOCK_GUARD_1'
     557 | DEFINE_LOCK_GUARD_1(raw_spinlock_irqsave, raw_spinlock_t,
         | ^~~~~~~~~~~~~~~~~~~
   include/linux/spinlock.h:281:17: note: in expansion of macro 'typecheck'
     281 |                 typecheck(unsigned long, flags);                \
         |                 ^~~~~~~~~
   include/linux/spinlock.h:559:21: note: in expansion of macro 'raw_spin_unlock_irqrestore'
     559 |                     raw_spin_unlock_irqrestore(_T->lock, _T->flags),
         |                     ^~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/typecheck.h:11:30: error: empty scalar initializer
      11 |         typeof(x) __dummy2 = {}; \
         |                              ^
   include/linux/cleanup.h:385:25: note: in definition of macro '__DEFINE_UNLOCK_GUARD'
     385 |         if (_T->lock) { _unlock; }                                      \
         |                         ^~~~~~~
   include/linux/spinlock.h:557:1: note: in expansion of macro 'DEFINE_LOCK_GUARD_1'
     557 | DEFINE_LOCK_GUARD_1(raw_spinlock_irqsave, raw_spinlock_t,
         | ^~~~~~~~~~~~~~~~~~~
   include/linux/spinlock.h:281:17: note: in expansion of macro 'typecheck'
     281 |                 typecheck(unsigned long, flags);                \
         |                 ^~~~~~~~~
   include/linux/spinlock.h:559:21: note: in expansion of macro 'raw_spin_unlock_irqrestore'
     559 |                     raw_spin_unlock_irqrestore(_T->lock, _T->flags),
         |                     ^~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/typecheck.h:11:30: note: (near initialization for '__dummy2')
      11 |         typeof(x) __dummy2 = {}; \
         |                              ^
   include/linux/cleanup.h:385:25: note: in definition of macro '__DEFINE_UNLOCK_GUARD'
     385 |         if (_T->lock) { _unlock; }                                      \
         |                         ^~~~~~~
   include/linux/spinlock.h:557:1: note: in expansion of macro 'DEFINE_LOCK_GUARD_1'
     557 | DEFINE_LOCK_GUARD_1(raw_spinlock_irqsave, raw_spinlock_t,
         | ^~~~~~~~~~~~~~~~~~~
   include/linux/spinlock.h:281:17: note: in expansion of macro 'typecheck'
     281 |                 typecheck(unsigned long, flags);                \
         |                 ^~~~~~~~~
   include/linux/spinlock.h:559:21: note: in expansion of macro 'raw_spin_unlock_irqrestore'
     559 |                     raw_spin_unlock_irqrestore(_T->lock, _T->flags),
         |                     ^~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/spinlock.h: In function 'class_raw_spinlock_irqsave_constructor':
...
...
include/linux/typecheck.h:10:24: error: empty scalar initializer
10 | ({      type __dummy = {}; \
         |                        ^
   include/linux/cleanup.h:394:9: note: in definition of macro '__DEFINE_LOCK_GUARD_1'
     394 |         _lock;                                                          \
         |         ^~~~~
   include/linux/spinlock.h:557:1: note: in expansion of macro 'DEFINE_LOCK_GUARD_1'
     557 | DEFINE_LOCK_GUARD_1(raw_spinlock_irqsave, raw_spinlock_t,
         | ^~~~~~~~~~~~~~~~~~~
   include/linux/spinlock.h:243:17: note: in expansion of macro 'typecheck'
     243 |                 typecheck(unsigned long, flags);        \
         |                 ^~~~~~~~~
   include/linux/spinlock.h:558:21: note: in expansion of macro 'raw_spin_lock_irqsave'
     558 |                     raw_spin_lock_irqsave(_T->lock, _T->flags),
         |                     ^~~~~~~~~~~~~~~~~~~~~
   include/linux/typecheck.h:10:24: note: (near initialization for '__dummy')
      10 | ({      type __dummy = {}; \
         |                        ^
   include/linux/cleanup.h:394:9: note: in definition of macro '__DEFINE_LOCK_GUARD_1'
     394 |         _lock;                                                          \
         |         ^~~~~
   include/linux/spinlock.h:557:1: note: in expansion of macro 'DEFINE_LOCK_GUARD_1'
     557 | DEFINE_LOCK_GUARD_1(raw_spinlock_irqsave, raw_spinlock_t,
         | ^~~~~~~~~~~~~~~~~~~
   include/linux/spinlock.h:243:17: note: in expansion of macro 'typecheck'
     243 |                 typecheck(unsigned long, flags);        \
         |                 ^~~~~~~~~
   include/linux/spinlock.h:558:21: note: in expansion of macro 'raw_spin_lock_irqsave'
     558 |                     raw_spin_lock_irqsave(_T->lock, _T->flags),
         |                     ^~~~~~~~~~~~~~~~~~~~~
   include/linux/typecheck.h:11:30: error: empty scalar initializer
      11 |         typeof(x) __dummy2 = {}; \
         |                              ^
   include/linux/cleanup.h:394:9: note: in definition of macro '__DEFINE_LOCK_GUARD_1'
     394 |         _lock;                                                          \
         |         ^~~~~
   include/linux/spinlock.h:557:1: note: in expansion of macro 'DEFINE_LOCK_GUARD_1'
     557 | DEFINE_LOCK_GUARD_1(raw_spinlock_irqsave, raw_spinlock_t,
         | ^~~~~~~~~~~~~~~~~~~
   include/linux/spinlock.h:243:17: note: in expansion of macro 'typecheck'
     243 |                 typecheck(unsigned long, flags);        \
         |                 ^~~~~~~~~
   include/linux/spinlock.h:558:21: note: in expansion of macro 'raw_spin_lock_irqsave'
     558 |                     raw_spin_lock_irqsave(_T->lock, _T->flags),
         |                     ^~~~~~~~~~~~~~~~~~~~~
   include/linux/typecheck.h:11:30: note: (near initialization for '__dummy2')
      11 |         typeof(x) __dummy2 = {}; \
         |                              ^
   include/linux/cleanup.h:394:9: note: in definition of macro '__DEFINE_LOCK_GUARD_1'
     394 |         _lock;                                                          \
         |         ^~~~~
   include/linux/spinlock.h:557:1: note: in expansion of macro 'DEFINE_LOCK_GUARD_1'
     557 | DEFINE_LOCK_GUARD_1(raw_spinlock_irqsave, raw_spinlock_t,
         | ^~~~~~~~~~~~~~~~~~~
   include/linux/spinlock.h:243:17: note: in expansion of macro 'typecheck'
     243 |                 typecheck(unsigned long, flags);        \
         |                 ^~~~~~~~~
   include/linux/spinlock.h:558:21: note: in expansion of macro 'raw_spin_lock_irqsave'
     558 |                     raw_spin_lock_irqsave(_T->lock, _T->flags),
         |                     ^~~~~~~~~~~~~~~~~~~~~
   include/linux/spinlock.h: In function 'class_raw_spinlock_irqsave_try_constructor':
...
...
include/linux/typecheck.h:10:24: error: empty scalar initializer
10 | ({      type __dummy = {}; \
         |                        ^
   include/linux/cleanup.h:255:25: note: in definition of macro 'EXTEND_CLASS'
     255 | { class_##_name##_t t = _init; return t; }
         |                         ^~~~~
   include/linux/spinlock.h:562:1: note: in expansion of macro 'DEFINE_LOCK_GUARD_1_COND'
     562 | DEFINE_LOCK_GUARD_1_COND(raw_spinlock_irqsave, _try,
         | ^~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/irqflags.h:172:17: note: in expansion of macro 'typecheck'
     172 |                 typecheck(unsigned long, flags);        \
         |                 ^~~~~~~~~
   include/linux/irqflags.h:216:17: note: in expansion of macro 'raw_local_irq_save'
     216 |                 raw_local_irq_save(flags);              \
         |                 ^~~~~~~~~~~~~~~~~~
   include/linux/spinlock.h:298:9: note: in expansion of macro 'local_irq_save'
     298 |         local_irq_save(flags); \
         |         ^~~~~~~~~~~~~~
   include/linux/spinlock.h:563:26: note: in expansion of macro 'raw_spin_trylock_irqsave'
     563 |                          raw_spin_trylock_irqsave(_T->lock, _T->flags))
         |                          ^~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/typecheck.h:10:24: note: (near initialization for '__dummy')
      10 | ({      type __dummy = {}; \
         |                        ^
   include/linux/cleanup.h:255:25: note: in definition of macro 'EXTEND_CLASS'
     255 | { class_##_name##_t t = _init; return t; }
         |                         ^~~~~
   include/linux/spinlock.h:562:1: note: in expansion of macro 'DEFINE_LOCK_GUARD_1_COND'
     562 | DEFINE_LOCK_GUARD_1_COND(raw_spinlock_irqsave, _try,
         | ^~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/irqflags.h:172:17: note: in expansion of macro 'typecheck'
     172 |                 typecheck(unsigned long, flags);        \
         |                 ^~~~~~~~~
   include/linux/irqflags.h:216:17: note: in expansion of macro 'raw_local_irq_save'
     216 |                 raw_local_irq_save(flags);              \
         |                 ^~~~~~~~~~~~~~~~~~
   include/linux/spinlock.h:298:9: note: in expansion of macro 'local_irq_save'
     298 |         local_irq_save(flags); \
         |         ^~~~~~~~~~~~~~
   include/linux/spinlock.h:563:26: note: in expansion of macro 'raw_spin_trylock_irqsave'
     563 |                          raw_spin_trylock_irqsave(_T->lock, _T->flags))
         |                          ^~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/typecheck.h:11:30: error: empty scalar initializer
      11 |         typeof(x) __dummy2 = {}; \
         |                              ^
   include/linux/cleanup.h:255:25: note: in definition of macro 'EXTEND_CLASS'
     255 | { class_##_name##_t t = _init; return t; }
         |                         ^~~~~
   include/linux/spinlock.h:562:1: note: in expansion of macro 'DEFINE_LOCK_GUARD_1_COND'
     562 | DEFINE_LOCK_GUARD_1_COND(raw_spinlock_irqsave, _try,
         | ^~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/irqflags.h:172:17: note: in expansion of macro 'typecheck'
     172 |                 typecheck(unsigned long, flags);        \
         |                 ^~~~~~~~~
   include/linux/irqflags.h:216:17: note: in expansion of macro 'raw_local_irq_save'
     216 |                 raw_local_irq_save(flags);              \
         |                 ^~~~~~~~~~~~~~~~~~
   include/linux/spinlock.h:298:9: note: in expansion of macro 'local_irq_save'
     298 |         local_irq_save(flags); \
         |         ^~~~~~~~~~~~~~
   include/linux/spinlock.h:563:26: note: in expansion of macro 'raw_spin_trylock_irqsave'
     563 |                          raw_spin_trylock_irqsave(_T->lock, _T->flags))
         |                          ^~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/typecheck.h:11:30: note: (near initialization for '__dummy2')
      11 |         typeof(x) __dummy2 = {}; \
         |                              ^
   include/linux/cleanup.h:255:25: note: in definition of macro 'EXTEND_CLASS'
     255 | { class_##_name##_t t = _init; return t; }
         |                         ^~~~~
   include/linux/spinlock.h:562:1: note: in expansion of macro 'DEFINE_LOCK_GUARD_1_COND'
     562 | DEFINE_LOCK_GUARD_1_COND(raw_spinlock_irqsave, _try,
         | ^~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/irqflags.h:172:17: note: in expansion of macro 'typecheck'
     172 |                 typecheck(unsigned long, flags);        \
         |                 ^~~~~~~~~
   include/linux/irqflags.h:216:17: note: in expansion of macro 'raw_local_irq_save'
     216 |                 raw_local_irq_save(flags);              \
         |                 ^~~~~~~~~~~~~~~~~~
   include/linux/spinlock.h:298:9: note: in expansion of macro 'local_irq_save'
     298 |         local_irq_save(flags); \
         |         ^~~~~~~~~~~~~~
   include/linux/spinlock.h:563:26: note: in expansion of macro 'raw_spin_trylock_irqsave'
     563 |                          raw_spin_trylock_irqsave(_T->lock, _T->flags))
         |                          ^~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/typecheck.h:10:24: error: empty scalar initializer
      10 | ({      type __dummy = {}; \
         |                        ^
   include/linux/cleanup.h:255:25: note: in definition of macro 'EXTEND_CLASS'
     255 | { class_##_name##_t t = _init; return t; }
         |                         ^~~~~
   include/linux/spinlock.h:562:1: note: in expansion of macro 'DEFINE_LOCK_GUARD_1_COND'
     562 | DEFINE_LOCK_GUARD_1_COND(raw_spinlock_irqsave, _try,
         | ^~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/irqflags.h:188:17: note: in expansion of macro 'typecheck'
     188 |                 typecheck(unsigned long, flags);        \
         |                 ^~~~~~~~~
   include/linux/irqflags.h:217:22: note: in expansion of macro 'raw_irqs_disabled_flags'
     217 |                 if (!raw_irqs_disabled_flags(flags))    \
         |                      ^~~~~~~~~~~~~~~~~~~~~~~
   include/linux/spinlock.h:298:9: note: in expansion of macro 'local_irq_save'
     298 |         local_irq_save(flags); \
vim +10 include/linux/typecheck.h
4	
     5	/*
     6	 * Check at compile time that something is of a particular type.
     7	 * Always evaluates to 1 so you may use it easily in comparisons.
     8	 */
     9	#define typecheck(type,x) \
...
10	({	type __dummy = {}; \
11		typeof(x) __dummy2 = {}; \
    12		(void)(&__dummy == &__dummy2); \
    13		1; \
    14	})
    15
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Re: [PATCH 2/2] include/linux/typecheck.h: Zero initialize dummy variables