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s390: correct some inline assembly constraints

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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
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@@ -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) {