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| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2017-10-09 19:20:44 +0200 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2017-12-04 19:52:53 +0100 |
| commit | b393e8b33efd2ee08576ceddc10c2b4bfb3b5435 (patch) | |
| tree | 1e0f9f3aa01484a8c815812f14e0f5a4c6890526 /lib/percpu-refcount.c | |
| parent | fs/dcache: Use release-acquire for name/length update (diff) | |
| download | linux-b393e8b33efd2ee08576ceddc10c2b4bfb3b5435.tar.xz linux-b393e8b33efd2ee08576ceddc10c2b4bfb3b5435.zip | |
percpu: READ_ONCE() now implies smp_read_barrier_depends()
Because READ_ONCE() now implies smp_read_barrier_depends(), this commit
removes the now-redundant smp_read_barrier_depends() following the
READ_ONCE() in __ref_is_percpu().
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Acked-by: Tejun Heo <tj@kernel.org>
Cc: Christoph Lameter <cl@linux.com>
Diffstat (limited to 'lib/percpu-refcount.c')
| -rw-r--r-- | lib/percpu-refcount.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/lib/percpu-refcount.c b/lib/percpu-refcount.c index fe03c6d52761..30e7dd88148b 100644 --- a/lib/percpu-refcount.c +++ b/lib/percpu-refcount.c @@ -197,10 +197,10 @@ static void __percpu_ref_switch_to_percpu(struct percpu_ref *ref) atomic_long_add(PERCPU_COUNT_BIAS, &ref->count); /* - * Restore per-cpu operation. smp_store_release() is paired with - * smp_read_barrier_depends() in __ref_is_percpu() and guarantees - * that the zeroing is visible to all percpu accesses which can see - * the following __PERCPU_REF_ATOMIC clearing. + * Restore per-cpu operation. smp_store_release() is paired + * with READ_ONCE() in __ref_is_percpu() and guarantees that the + * zeroing is visible to all percpu accesses which can see the + * following __PERCPU_REF_ATOMIC clearing. */ for_each_possible_cpu(cpu) *per_cpu_ptr(percpu_count, cpu) = 0; |