The maximum number of keys that can be allocated has to take into consideration, that some keys are reserved by the architecture for specific purpose. Hence cannot be allocated.
Fix the assertion in test_pkey_alloc_exhaust()
cc: Dave Hansen dave.hansen@intel.com cc: Florian Weimer fweimer@redhat.com Signed-off-by: Ram Pai linuxram@us.ibm.com --- tools/testing/selftests/vm/pkey-helpers.h | 14 ++++++++++++++ tools/testing/selftests/vm/protection_keys.c | 9 ++++----- 2 files changed, 18 insertions(+), 5 deletions(-)
diff --git a/tools/testing/selftests/vm/pkey-helpers.h b/tools/testing/selftests/vm/pkey-helpers.h index 88ef58f..67f9b0f 100644 --- a/tools/testing/selftests/vm/pkey-helpers.h +++ b/tools/testing/selftests/vm/pkey-helpers.h @@ -416,4 +416,18 @@ static inline int get_start_key(void) #endif }
+static inline int arch_reserved_keys(void) +{ +#if defined(__i386__) || defined(__x86_64__) /* arch */ + return NR_RESERVED_PKEYS; +#elif __powerpc64__ /* arch */ + if (sysconf(_SC_PAGESIZE) == 4096) + return NR_RESERVED_PKEYS_4K; + else + return NR_RESERVED_PKEYS_64K; +#else /* arch */ + NOT SUPPORTED +#endif /* arch */ +} + #endif /* _PKEYS_HELPER_H */ diff --git a/tools/testing/selftests/vm/protection_keys.c b/tools/testing/selftests/vm/protection_keys.c index 58da5a0..aae6771 100644 --- a/tools/testing/selftests/vm/protection_keys.c +++ b/tools/testing/selftests/vm/protection_keys.c @@ -1167,12 +1167,11 @@ void test_pkey_alloc_exhaust(int *ptr, u16 pkey) pkey_assert(i < NR_PKEYS*2);
/* - * There are 16 pkeys supported in hardware. One is taken - * up for the default (0) and another can be taken up by - * an execute-only mapping. Ensure that we can allocate - * at least 14 (16-2). + * There are NR_PKEYS pkeys supported in hardware. arch_reserved_keys() + * are reserved. One can be taken up by an execute-only mapping. + * Ensure that we can allocate at least the remaining. */ - pkey_assert(i >= NR_PKEYS-2); + pkey_assert(i >= (NR_PKEYS-arch_reserved_keys()-1));
for (i = 0; i < nr_allocated_pkeys; i++) { err = sys_pkey_free(allocated_pkeys[i]);