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authorChristian Borntraeger <borntraeger@de.ibm.com>2013-06-05 09:25:34 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2013-06-05 17:36:21 +0200
commita8f6e7f7953d1baa05a346bf7cee44f1d022c63d (patch)
treef2e13e105946dac24116a7eb34a93f26f48652c0
parent3a82603be4f5523ce21dd468a323aa36ff845f6d (diff)
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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: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
-rw-r--r--arch/s390/include/asm/pgtable.h5
1 files changed, 3 insertions, 2 deletions
diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h
index f9a0a70dc936..e8b6e5b8932c 100644
--- a/arch/s390/include/asm/pgtable.h
+++ b/arch/s390/include/asm/pgtable.h
@@ -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
}