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mips/gup: Replace ACCESS_ONCE with READ_ONCE

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ACCESS_ONCE does not work reliably on non-scalar types. For
example gcc 4.6 and 4.7 might remove the volatile tag for such
accesses during the SRA (scalar replacement of aggregates) step
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58145)

Change the gup code to replace ACCESS_ONCE with READ_ONCE.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Christian Borntraeger 2014-11-21 16:21:56 +01:00
parent 14cf3d977b
commit 4218091cb4
1 changed files with 1 additions and 1 deletions
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2
arch/mips/mm/gup.c
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@ -30,7 +30,7 @@ static inline pte_t gup_get_pte(pte_t *ptep)
return pte;
#else
return ACCESS_ONCE(*ptep);
return READ_ONCE(*ptep);
#endif
}