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Commit 931641c6 authored by Heiko Carstens's avatar Heiko Carstens Committed by Martin Schwidefsky
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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: default avatarHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent db7f5eef

arch/s390/mm/page-states.c

+9 −4
Original line number Diff line number Diff line
@@ -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;

}