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s390: correct some inline assembly constraints 

Inline assembly code changed in this patch should really use "Q"
constraint "Memory reference without index register and with short
displacement". The kernel build with kasan instrumentation enabled
might occasionally break otherwise (due to stack instrumentation).

Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Vasily Gorbik 2019-04-15 12:41:08 +02:00 committed by Martin Schwidefsky
parent 6b1f16ba73
commit 35af0d469c
2 changed files with 5 additions and 5 deletions
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2
arch/s390/kernel/fpu.c
View File

@ -23,7 +23,7 @@ void __kernel_fpu_begin(struct kernel_fpu *state, u32 flags)
if (flags & KERNEL_FPC)
/* Save floating point control */
asm volatile("stfpc %0" : "=m" (state->fpc));
asm volatile("stfpc %0" : "=Q" (state->fpc));
if (!MACHINE_HAS_VX) {
if (flags & KERNEL_VXR_V0V7) {

8
arch/s390/kernel/vtime.c
View File

@ -37,7 +37,7 @@ static inline u64 get_vtimer(void)
{
u64 timer;
asm volatile("stpt %0" : "=m" (timer));
asm volatile("stpt %0" : "=Q" (timer));
return timer;
}
@ -48,7 +48,7 @@ static inline void set_vtimer(u64 expires)
asm volatile(
" stpt %0\n" /* Store current cpu timer value */
" spt %1" /* Set new value imm. afterwards */
: "=m" (timer) : "m" (expires));
: "=Q" (timer) : "Q" (expires));
S390_lowcore.system_timer += S390_lowcore.last_update_timer - timer;
S390_lowcore.last_update_timer = expires;
}
@ -135,8 +135,8 @@ static int do_account_vtime(struct task_struct *tsk)
#else
" stck %1" /* Store current tod clock value */
#endif
: "=m" (S390_lowcore.last_update_timer),
"=m" (S390_lowcore.last_update_clock));
: "=Q" (S390_lowcore.last_update_timer),
"=Q" (S390_lowcore.last_update_clock));
clock = S390_lowcore.last_update_clock - clock;
timer -= S390_lowcore.last_update_timer;