linux-kernel - [PATCH 5/6] mm/gup: Replace ACCESS_ONCE with READ_ONCE for STRICT_MM

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Date:	Wed, 25 Mar 2015 20:11:58 +1100
From:	Michael Ellerman <mpe@...erman.id.au>
To:	<linuxppc-dev@...abs.org>
Cc:	<linux-kernel@...r.kernel.org>, aneesh.kumar@...ibm.com,
	akpm@...ux-foundation.org, kirill.shutemov@...ux.intel.com,
	aarcange@...hat.com, borntraeger@...ibm.com,
	steve.capper@...aro.org, linux-mm@...ck.org
Subject: [PATCH 5/6] mm/gup: Replace ACCESS_ONCE with READ_ONCE for STRICT_MM_TYPECHECKS

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@...ux-foundation.org
Cc: kirill.shutemov@...ux.intel.com
Cc: aarcange@...hat.com
Cc: borntraeger@...ibm.com
Cc: steve.capper@...aro.org
Cc: linux-mm@...ck.org
Signed-off-by: Michael Ellerman <mpe@...erman.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

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