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author | 2014-11-24 10:53:11 +0100 | |
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committer | 2014-12-18 09:54:40 +0100 | |
commit | af2e7aaed1ccf30e61af3e096ac2c7df2f2d6c2a (patch) | |
tree | 6e9e15b79431ca3f4be281e98491b86205f1fa7f | |
parent | mips/gup: Replace ACCESS_ONCE with READ_ONCE (diff) | |
download | linux-af2e7aaed1ccf30e61af3e096ac2c7df2f2d6c2a.tar.gz linux-af2e7aaed1ccf30e61af3e096ac2c7df2f2d6c2a.tar.bz2 linux-af2e7aaed1ccf30e61af3e096ac2c7df2f2d6c2a.zip |
arm64/spinlock: Replace ACCESS_ONCE 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 spinlock 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>
-rw-r--r-- | arch/arm64/include/asm/spinlock.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/arm64/include/asm/spinlock.h b/arch/arm64/include/asm/spinlock.h index c45b7b1b7197..cee128732435 100644 --- a/arch/arm64/include/asm/spinlock.h +++ b/arch/arm64/include/asm/spinlock.h @@ -99,12 +99,12 @@ static inline int arch_spin_value_unlocked(arch_spinlock_t lock) static inline int arch_spin_is_locked(arch_spinlock_t *lock) { - return !arch_spin_value_unlocked(ACCESS_ONCE(*lock)); + return !arch_spin_value_unlocked(READ_ONCE(*lock)); } static inline int arch_spin_is_contended(arch_spinlock_t *lock) { - arch_spinlock_t lockval = ACCESS_ONCE(*lock); + arch_spinlock_t lockval = READ_ONCE(*lock); return (lockval.next - lockval.owner) > 1; } #define arch_spin_is_contended arch_spin_is_contended |