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s390/nmi: fix inline assembly constraints 

Add missing memory clobbers / barriers or use the Q constraint where
possible to tell the compiler that the inline assemblies actually
access memory and not only pointers to memory.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens 2016-12-13 12:42:07 +01:00 committed by Martin Schwidefsky
parent 7a71fd1c59
commit 86fa7087d3
1 changed files with 10 additions and 9 deletions
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19
arch/s390/kernel/nmi.c
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@ -102,7 +102,7 @@ static int notrace s390_validate_registers(union mci mci, int umode)
{
int kill_task;
u64 zero;
void *fpt_save_area, *fpt_creg_save_area;
void *fpt_save_area;
kill_task = 0;
zero = 0;
@ -130,7 +130,6 @@ static int notrace s390_validate_registers(union mci mci, int umode)
kill_task = 1;
}
fpt_save_area = &S390_lowcore.floating_pt_save_area;
fpt_creg_save_area = &S390_lowcore.fpt_creg_save_area;
if (!mci.fc) {
/*
* Floating point control register can't be restored.
@ -142,11 +141,13 @@ static int notrace s390_validate_registers(union mci mci, int umode)
*/
if (S390_lowcore.fpu_flags & KERNEL_FPC)
s390_handle_damage();
asm volatile("lfpc 0(%0)" : : "a" (&zero), "m" (zero));
asm volatile("lfpc %0" : : "Q" (zero));
if (!test_cpu_flag(CIF_FPU))
kill_task = 1;
} else
asm volatile("lfpc 0(%0)" : : "a" (fpt_creg_save_area));
} else {
asm volatile("lfpc %0"
: : "Q" (S390_lowcore.fpt_creg_save_area));
}
if (!MACHINE_HAS_VX) {
/* Validate floating point registers */
@ -167,7 +168,7 @@ static int notrace s390_validate_registers(union mci mci, int umode)
" ld 13,104(%0)\n"
" ld 14,112(%0)\n"
" ld 15,120(%0)\n"
: : "a" (fpt_save_area));
: : "a" (fpt_save_area) : "memory");
} else {
/* Validate vector registers */
union ctlreg0 cr0;
@ -217,7 +218,7 @@ static int notrace s390_validate_registers(union mci mci, int umode)
} else {
asm volatile(
" lctlg 0,15,0(%0)"
: : "a" (&S390_lowcore.cregs_save_area));
: : "a" (&S390_lowcore.cregs_save_area) : "memory");
}
/*
* We don't even try to validate the TOD register, since we simply
@ -234,9 +235,9 @@ static int notrace s390_validate_registers(union mci mci, int umode)
: : : "0", "cc");
else
asm volatile(
" l 0,0(%0)\n"
" l 0,%0\n"
" sckpf"
: : "a" (&S390_lowcore.tod_progreg_save_area)
: : "Q" (S390_lowcore.tod_progreg_save_area)
: "0", "cc");
/* Validate clock comparator register */
set_clock_comparator(S390_lowcore.clock_comparator);