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| author | Christoph Lameter <cl@linux.com> | 2010-10-26 14:23:09 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-10-26 16:52:19 -0700 |
| commit | ea00c30b5b31baa91be29bee966204eccc15e9d3 (patch) | |
| tree | de5ad33475f3234048cc07d4676d963b8b4f314e /lib | |
| parent | 041b78f232bb87b2de8ca3fed50384bc7dc9c2de (diff) | |
| download | lwn-ea00c30b5b31baa91be29bee966204eccc15e9d3.tar.gz lwn-ea00c30b5b31baa91be29bee966204eccc15e9d3.zip | |
percpu_counter: use this_cpu_ptr() instead of per_cpu_ptr()
this_cpu_ptr() avoids an array lookup and can use the percpu offset of the
local cpu directly.
Signed-off-by: Christoph Lameter <cl@linux.com>
Cc: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/percpu_counter.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/lib/percpu_counter.c b/lib/percpu_counter.c index 1d954ea72331..604678d7d06d 100644 --- a/lib/percpu_counter.c +++ b/lib/percpu_counter.c @@ -73,9 +73,9 @@ void __percpu_counter_add(struct percpu_counter *fbc, s64 amount, s32 batch) { s64 count; s32 *pcount; - int cpu = get_cpu(); - pcount = per_cpu_ptr(fbc->counters, cpu); + preempt_disable(); + pcount = this_cpu_ptr(fbc->counters); count = *pcount + amount; if (count >= batch || count <= -batch) { spin_lock(&fbc->lock); @@ -85,7 +85,7 @@ void __percpu_counter_add(struct percpu_counter *fbc, s64 amount, s32 batch) } else { *pcount = count; } - put_cpu(); + preempt_enable(); } EXPORT_SYMBOL(__percpu_counter_add); |