diff options
| author | Vasily Gorbik <gor@linux.ibm.com> | 2018-10-19 13:13:58 +0300 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2018-10-22 09:37:45 +0300 |
| commit | cf3dbe5dacb3a95d497ace9c714306d17cb05b11 (patch) | |
| tree | 0b4bb870e5d7c0c09e1a7e8fb797f08530745297 /arch/s390/include/asm | |
| parent | 63c19be095d0f8eb8992674991e44b4228bd4179 (diff) | |
| download | linux-cf3dbe5dacb3a95d497ace9c714306d17cb05b11.tar.xz | |
s390/kasan: support preemptible kernel build
When the kernel is built with:
CONFIG_PREEMPT=y
CONFIG_PREEMPT_COUNT=y
"stfle" function used by kasan initialization code makes additional
call to preempt_count_add/preempt_count_sub. To avoid removing kasan
instrumentation from sched code where those functions leave split stfle
function and provide __stfle variant without preemption handling to be
used by Kasan.
Reported-by: Benjamin Block <bblock@linux.ibm.com>
Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/include/asm')
| -rw-r--r-- | arch/s390/include/asm/facility.h | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/arch/s390/include/asm/facility.h b/arch/s390/include/asm/facility.h index 99c8ce30b3cd..e78cda94456b 100644 --- a/arch/s390/include/asm/facility.h +++ b/arch/s390/include/asm/facility.h @@ -64,11 +64,10 @@ static inline int test_facility(unsigned long nr) * @stfle_fac_list: array where facility list can be stored * @size: size of passed in array in double words */ -static inline void stfle(u64 *stfle_fac_list, int size) +static inline void __stfle(u64 *stfle_fac_list, int size) { unsigned long nr; - preempt_disable(); asm volatile( " stfl 0(0)\n" : "=m" (S390_lowcore.stfl_fac_list)); @@ -85,6 +84,12 @@ static inline void stfle(u64 *stfle_fac_list, int size) nr = (reg0 + 1) * 8; /* # bytes stored by stfle */ } memset((char *) stfle_fac_list + nr, 0, size * 8 - nr); +} + +static inline void stfle(u64 *stfle_fac_list, int size) +{ + preempt_disable(); + __stfle(stfle_fac_list, size); preempt_enable(); } |