[PATCH 5/6] mm/gup: Replace ACCESS_ONCE with READ_ONCE for STRICT_MM_TYPECHECKS
From: Michael Ellerman <mpe@ellerman.id.au>
Date: 2015-03-25 09:14:50
Also in:
linux-mm, lkml
Subsystem:
memory management, memory management - gup (get user pages), the rest · Maintainers:
Andrew Morton, David Hildenbrand, Linus Torvalds
If STRICT_MM_TYPECHECKS is enabled the generic gup code fails to build because we are using ACCESS_ONCE on non-scalar types. Convert all uses to READ_ONCE. Cc: akpm@linux-foundation.org Cc: kirill.shutemov@linux.intel.com Cc: aarcange@redhat.com Cc: borntraeger@de.ibm.com Cc: steve.capper@linaro.org Cc: linux-mm@kvack.org Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> --- mm/gup.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/mm/gup.c b/mm/gup.c
index a6e24e246f86..120c3adc843c 100644
--- a/mm/gup.c
+++ b/mm/gup.c@@ -901,7 +901,7 @@ static int gup_pte_range(pmd_t pmd, unsigned long addr, unsigned long end, * * for an example see gup_get_pte in arch/x86/mm/gup.c */ - pte_t pte = ACCESS_ONCE(*ptep); + pte_t pte = READ_ONCE(*ptep); struct page *page; /*
@@ -1191,7 +1191,7 @@ int __get_user_pages_fast(unsigned long start, int nr_pages, int write, local_irq_save(flags); pgdp = pgd_offset(mm, addr); do { - pgd_t pgd = ACCESS_ONCE(*pgdp); + pgd_t pgd = READ_ONCE(*pgdp); next = pgd_addr_end(addr, end); if (pgd_none(pgd))
--
2.1.0