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Commit a8f6e7f7 authored by Christian Borntraeger's avatar Christian Borntraeger Committed by Martin Schwidefsky
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s390/pgtable: make pgste lock an explicit barrier 



Getting and Releasing the pgste lock has lock semantics. Make the
code an explicit barrier.

Signed-off-by: default avatarChristian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 3a82603b

arch/s390/include/asm/pgtable.h

+3 −2
Original line number Diff line number Diff line
@@ -623,7 +623,7 @@ static inline pgste_t pgste_get_lock(pte_t *ptep) 
		"	csg	%0,%1,%2\n"

		"	jl	0b\n"

		: "=&d" (old), "=&d" (new), "=Q" (ptep[PTRS_PER_PTE])

		: "Q" (ptep[PTRS_PER_PTE]) : "cc");

		: "Q" (ptep[PTRS_PER_PTE]) : "cc", "memory");

#endif

	return __pgste(new);

}
@@ -635,7 +635,8 @@ static inline void pgste_set_unlock(pte_t *ptep, pgste_t pgste) 
		"	nihh	%1,0xff7f\n"	/* clear RCP_PCL_BIT */

		"	stg	%1,%0\n"

		: "=Q" (ptep[PTRS_PER_PTE])

		: "d" (pgste_val(pgste)), "Q" (ptep[PTRS_PER_PTE]) : "cc");

		: "d" (pgste_val(pgste)), "Q" (ptep[PTRS_PER_PTE])

		: "cc", "memory");

	preempt_enable();

#endif

}