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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>
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1 changed files with 2 additions and 2 deletions
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@ -99,12 +99,12 @@ static inline int arch_spin_value_unlocked(arch_spinlock_t lock)
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static inline int arch_spin_is_locked(arch_spinlock_t *lock)
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{
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return !arch_spin_value_unlocked(ACCESS_ONCE(*lock));
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return !arch_spin_value_unlocked(READ_ONCE(*lock));
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}
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static inline int arch_spin_is_contended(arch_spinlock_t *lock)
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{
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arch_spinlock_t lockval = ACCESS_ONCE(*lock);
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arch_spinlock_t lockval = READ_ONCE(*lock);
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return (lockval.next - lockval.owner) > 1;
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}
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#define arch_spin_is_contended arch_spin_is_contended
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