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| author | Fan Du <fan.du@windriver.com> | 2013-07-03 15:05:19 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-07-03 16:07:43 -0700 |
| commit | 64df3071a97f20767f63b88c573791691a855b5c (patch) | |
| tree | d7f8de21c425465f6e790c5de74d2dc54214b9e3 /lib/percpu_counter.c | |
| parent | 5cb0656b62ff1199763764e4f6b4c06d30d5d0f5 (diff) | |
| download | lwn-64df3071a97f20767f63b88c573791691a855b5c.tar.gz lwn-64df3071a97f20767f63b88c573791691a855b5c.zip | |
lib/percpu_counter.c: __this_cpu_write() doesn't need to be protected by spinlock
__this_cpu_write doesn't need to be protected by spinlock, AS we are doing
per cpu write with preempt disabled. And another reason to remove
__this_cpu_write outside of spinlock: __percpu_counter_sum is not an
accurate counter.
Signed-off-by: Fan Du <fan.du@windriver.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'lib/percpu_counter.c')
| -rw-r--r-- | lib/percpu_counter.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/percpu_counter.c b/lib/percpu_counter.c index ba6085d9c741..1fc23a3277e1 100644 --- a/lib/percpu_counter.c +++ b/lib/percpu_counter.c @@ -80,8 +80,8 @@ void __percpu_counter_add(struct percpu_counter *fbc, s64 amount, s32 batch) if (count >= batch || count <= -batch) { raw_spin_lock(&fbc->lock); fbc->count += count; - __this_cpu_write(*fbc->counters, 0); raw_spin_unlock(&fbc->lock); + __this_cpu_write(*fbc->counters, 0); } else { __this_cpu_write(*fbc->counters, count); } |