On 4/28/19 4:39 PM, Sasha Levin wrote:

Hi,

[This is an automated email]

This commit has been processed because it contains a "Fixes:" tag, fixing commit: 70800c3c0cc5 locking/rwsem: Scan the wait_list for readers only once.

The bot has tested the following trees: v5.0.10, v4.19.37, v4.14.114, v4.9.171.

v5.0.10: Failed to apply! Possible dependencies: 412f34a82ccf ("locking/qspinlock_stat: Track the no MCS node available case") 46ad0840b158 ("locking/rwsem: Remove arch specific rwsem files") 579afe866f52 ("xtensa: use generic spinlock/rwlock implementation") a8654596f037 ("locking/rwsem: Enable lock event counting") ad53fa10fa9e ("locking/qspinlock_stat: Introduce generic lockevent_*() counting APIs") c7580c1e8443 ("locking/rwsem: Move owner setting code from rwsem.c to rwsem.h") ce9084ba0d1d ("x86: Make ARCH_USE_MEMREMAP_PROT a generic Kconfig symbol") d682b596d993 ("locking/qspinlock: Handle > 4 slowpath nesting levels") eecec78f7777 ("locking/rwsem: Relocate rwsem_down_read_failed()") fb346fd9fc08 ("locking/lock_events: Make lock_events available for all archs & other locks")

v4.19.37: Failed to apply! Possible dependencies: 0fa809ca7f81 ("locking/pvqspinlock: Extend node size when pvqspinlock is configured") 1222109a5363 ("locking/qspinlock_stat: Count instances of nested lock slowpaths") 412f34a82ccf ("locking/qspinlock_stat: Track the no MCS node available case") 46ad0840b158 ("locking/rwsem: Remove arch specific rwsem files") 4b486b535c33 ("locking/rwsem: Exit read lock slowpath if queue empty & no writer") 925b9cd1b89a ("locking/rwsem: Make owner store task pointer of last owning reader") a8654596f037 ("locking/rwsem: Enable lock event counting") ad53fa10fa9e ("locking/qspinlock_stat: Introduce generic lockevent_*() counting APIs") c7580c1e8443 ("locking/rwsem: Move owner setting code from rwsem.c to rwsem.h") ce9084ba0d1d ("x86: Make ARCH_USE_MEMREMAP_PROT a generic Kconfig symbol") d682b596d993 ("locking/qspinlock: Handle > 4 slowpath nesting levels") eecec78f7777 ("locking/rwsem: Relocate rwsem_down_read_failed()") fb346fd9fc08 ("locking/lock_events: Make lock_events available for all archs & other locks")

v4.14.114: Failed to apply! Possible dependencies: 0fa809ca7f81 ("locking/pvqspinlock: Extend node size when pvqspinlock is configured") 11752adb68a3 ("locking/pvqspinlock: Implement hybrid PV queued/unfair locks") 1222109a5363 ("locking/qspinlock_stat: Count instances of nested lock slowpaths") 1958b5fc4010 ("x86/boot: Add early boot support when running with SEV active") 1cd9c22fee3a ("x86/mm/encrypt: Move page table helpers into separate translation unit") 271ca788774a ("arch: enable relative relocations for arm64, power and x86") 412f34a82ccf ("locking/qspinlock_stat: Track the no MCS node available case") 81d3dc9a349b ("locking/qspinlock: Add stat tracking for pending vs. slowpath") 94d49eb30e85 ("x86/mm: Decouple dynamic __PHYSICAL_MASK from AMD SME") a8654596f037 ("locking/rwsem: Enable lock event counting") ad53fa10fa9e ("locking/qspinlock_stat: Introduce generic lockevent_*() counting APIs") ce9084ba0d1d ("x86: Make ARCH_USE_MEMREMAP_PROT a generic Kconfig symbol") d682b596d993 ("locking/qspinlock: Handle > 4 slowpath nesting levels") d7b417fa08d1 ("x86/mm: Add DMA support for SEV memory encryption") d8aa7eea78a1 ("x86/mm: Add Secure Encrypted Virtualization (SEV) support") dfaaec9033b8 ("x86: Add support for changing memory encryption attribute in early boot") fb346fd9fc08 ("locking/lock_events: Make lock_events available for all archs & other locks")

v4.9.171: Failed to apply! Possible dependencies: 1a8b6d76dc5b ("net:add one common config ARCH_WANT_RELAX_ORDER to support relax ordering") 271ca788774a ("arch: enable relative relocations for arm64, power and x86") 29dee3c03abc ("locking/refcounts: Out-of-line everything") 40565b5aedd6 ("sched/cputime, powerpc, s390: Make scaled cputime arch specific") 4ad8622dc548 ("powerpc/8xx: Implement hw_breakpoint") 51c9c0843993 ("powerpc/kprobes: Implement Optprobes") 5b9ff0278598 ("powerpc: Build-time sort the exception table") 65c059bcaa73 ("powerpc: Enable support for GCC plugins") 9fea59bd7ca5 ("powerpc/mm: Add support for runtime configuration of ASLR limits") a7d2475af7ae ("powerpc: Sort the selects under CONFIG_PPC") a8654596f037 ("locking/rwsem: Enable lock event counting") bd174169c7a1 ("locking/refcount: Add refcount_t API kernel-doc comments") ce9084ba0d1d ("x86: Make ARCH_USE_MEMREMAP_PROT a generic Kconfig symbol") d557d1b58b35 ("refcount: change EXPORT_SYMBOL markings") ebfa50df435e ("powerpc: Add helper to check if offset is within relative branch range") f405df5de317 ("refcount_t: Introduce a special purpose refcount type") fa769d3f58e6 ("powerpc/32: Enable HW_BREAKPOINT on BOOK3S") fb346fd9fc08 ("locking/lock_events: Make lock_events available for all archs & other locks") fd25d19f6b8d ("locking/refcount: Create unchecked atomic_t implementation")

How should we proceed with this patch?

I will send out a version that will be easier to backport once this patch lands in the mainline.

Cheers, Longman