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s390/mm: use basic block for essa inline assembly

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Use only simple inline assemblies which consist of a single basic
block if the register asm construct is being used.

Otherwise gcc would generate broken code if the compiler option
--sanitize-coverage=trace-pc would be used.

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 2016-06-20 13:31:55 +02:00 committed by Martin Schwidefsky
parent db7f5eef3d
commit 931641c639
1 changed files with 9 additions and 4 deletions
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13
arch/s390/mm/page-states.c
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@ -34,20 +34,25 @@ static int __init cmma(char *str)
}
__setup("cmma=", cmma);
void __init cmma_init(void)
static inline int cmma_test_essa(void)
{
register unsigned long tmp asm("0") = 0;
register int rc asm("1") = -EOPNOTSUPP;
if (!cmma_flag)
return;
asm volatile(
" .insn rrf,0xb9ab0000,%1,%1,0,0\n"
"0: la %0,0\n"
"1:\n"
EX_TABLE(0b,1b)
: "+&d" (rc), "+&d" (tmp));
if (rc)
return rc;
}
void __init cmma_init(void)
{
if (!cmma_flag)
return;
if (cmma_test_essa())
cmma_flag = 0;
}