From 64df3071a97f20767f63b88c573791691a855b5c Mon Sep 17 00:00:00 2001 From: Fan Du Date: Wed, 3 Jul 2013 15:05:19 -0700 Subject: 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 Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- lib/percpu_counter.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'lib/percpu_counter.c') 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); } -- cgit v1.2.3-59-g8ed1b