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| author |   Heiko Carstens <heiko.carstens@de.ibm.com> | 2016-06-20 13:31:55 +0200 |
|---|---|---|
| committer |   Martin Schwidefsky <schwidefsky@de.ibm.com> | 2016-06-28 09:32:29 +0200 |
| commit | 931641c639cea024d4462d79ad9716406bba7b19 (patch) | |
| tree | ed985ee956f8cb7469ed44dcd45d4175eeaa3fe7 /arch | |
| parent | s390/lib: use basic blocks for inline assemblies (diff) | |
| download | linux-dev-931641c639cea024d4462d79ad9716406bba7b19.tar.xz linux-dev-931641c639cea024d4462d79ad9716406bba7b19.zip | |
s390/mm: use basic block for essa inline assembly
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>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/s390/mm/page-states.c | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/arch/s390/mm/page-states.c b/arch/s390/mm/page-states.c index a90d45e9dfb0..3330ea124eec 100644 --- a/arch/s390/mm/page-states.c +++ b/arch/s390/mm/page-states.c @@ -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; } |