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authorChristian Borntraeger <borntraeger@de.ibm.com>2015-01-06 22:47:41 +0100
committerChristian Borntraeger <borntraeger@de.ibm.com>2015-01-19 14:14:19 +0100
commitda1a288d8562739aa8ba0273d4fb6b73b856c0d3 (patch)
tree80d57ed776241fbcc48339d1ef1012cd39a5cf69 /arch/powerpc/mm
parent5ee07612e9e20817bb99256ab6cf1400fd5aa270 (diff)
ppc/hugetlbfs: Replace ACCESS_ONCE with READ_ONCE
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 ppc/hugetlbfs code to replace ACCESS_ONCE with READ_ONCE. Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Diffstat (limited to 'arch/powerpc/mm')
-rw-r--r--arch/powerpc/mm/hugetlbpage.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/powerpc/mm/hugetlbpage.c b/arch/powerpc/mm/hugetlbpage.c
index 5ff4e07d920a..620d0ec93e6f 100644
--- a/arch/powerpc/mm/hugetlbpage.c
+++ b/arch/powerpc/mm/hugetlbpage.c
@@ -978,7 +978,7 @@ pte_t *find_linux_pte_or_hugepte(pgd_t *pgdir, unsigned long ea, unsigned *shift
*/
pdshift = PUD_SHIFT;
pudp = pud_offset(&pgd, ea);
- pud = ACCESS_ONCE(*pudp);
+ pud = READ_ONCE(*pudp);
if (pud_none(pud))
return NULL;
@@ -990,7 +990,7 @@ pte_t *find_linux_pte_or_hugepte(pgd_t *pgdir, unsigned long ea, unsigned *shift
else {
pdshift = PMD_SHIFT;
pmdp = pmd_offset(&pud, ea);
- pmd = ACCESS_ONCE(*pmdp);
+ pmd = READ_ONCE(*pmdp);
/*
* A hugepage collapse is captured by pmd_none, because
* it mark the pmd none and do a hpte invalidate.