On Wed, Dec 03, 2014 at 11:30:17PM +0100, Christian Borntraeger wrote: > 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 <[email protected]>
Acked-by: Paul E. McKenney <[email protected]> > --- > arch/mips/mm/gup.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/arch/mips/mm/gup.c b/arch/mips/mm/gup.c > index 06ce17c..8aa50e3 100644 > --- a/arch/mips/mm/gup.c > +++ b/arch/mips/mm/gup.c > @@ -30,7 +30,7 @@ retry: > > return pte; > #else > - return ACCESS_ONCE(*ptep); > + return READ_ONCE(*ptep); > #endif > } > > -- > 1.9.3 > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
