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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>
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1 changed files with 9 additions and 4 deletions
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@ -34,20 +34,25 @@ static int __init cmma(char *str)
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}
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__setup("cmma=", cmma);
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void __init cmma_init(void)
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static inline int cmma_test_essa(void)
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{
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register unsigned long tmp asm("0") = 0;
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register int rc asm("1") = -EOPNOTSUPP;
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if (!cmma_flag)
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return;
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asm volatile(
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" .insn rrf,0xb9ab0000,%1,%1,0,0\n"
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"0: la %0,0\n"
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"1:\n"
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EX_TABLE(0b,1b)
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: "+&d" (rc), "+&d" (tmp));
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if (rc)
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return rc;
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}
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void __init cmma_init(void)
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{
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if (!cmma_flag)
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return;
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if (cmma_test_essa())
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cmma_flag = 0;
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}
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