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authorAndrew Morton <akpm@linux-foundation.org>2008-12-09 13:14:14 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2008-12-10 08:01:52 -0800
commit02d211688727ad02bb4555b1aa8ae2de16b21b39 (patch)
tree2ee10b2f0cbfb615c40a2df98627426b8543d6cd /lib
parent71c5576fbd809f2015f4eddf72e501e298720cf3 (diff)
revert "percpu_counter: new function percpu_counter_sum_and_set"
Revert commit e8ced39d5e8911c662d4d69a342b9d053eaaac4e Author: Mingming Cao <cmm@us.ibm.com> Date: Fri Jul 11 19:27:31 2008 -0400 percpu_counter: new function percpu_counter_sum_and_set As described in revert "percpu counter: clean up percpu_counter_sum_and_set()" the new percpu_counter_sum_and_set() is racy against updates to the cpu-local accumulators on other CPUs. Revert that change. This means that ext4 will be slow again. But correct. Reported-by: Eric Dumazet <dada1@cosmosbay.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Mingming Cao <cmm@us.ibm.com> Cc: <linux-ext4@vger.kernel.org> Cc: <stable@kernel.org> [2.6.27.x] 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.c7
1 files changed, 1 insertions, 6 deletions
diff --git a/lib/percpu_counter.c b/lib/percpu_counter.c
index dba1530a5b29..b255b939bc1b 100644
--- a/lib/percpu_counter.c
+++ b/lib/percpu_counter.c
@@ -52,7 +52,7 @@ EXPORT_SYMBOL(__percpu_counter_add);
* Add up all the per-cpu counts, return the result. This is a more accurate
* but much slower version of percpu_counter_read_positive()
*/
-s64 __percpu_counter_sum(struct percpu_counter *fbc, int set)
+s64 __percpu_counter_sum(struct percpu_counter *fbc)
{
s64 ret;
int cpu;
@@ -62,12 +62,7 @@ s64 __percpu_counter_sum(struct percpu_counter *fbc, int set)
for_each_online_cpu(cpu) {
s32 *pcount = per_cpu_ptr(fbc->counters, cpu);
ret += *pcount;
- if (set)
- *pcount = 0;
}
- if (set)
- fbc->count = ret;
-
spin_unlock(&fbc->lock);
return ret;
}