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authorMingming Cao <cmm@us.ibm.com>2008-10-09 12:50:59 -0400
committerTheodore Ts'o <tytso@mit.edu>2008-10-09 12:50:59 -0400
commit1f7c14c62ce63805f9574664a6c6de3633d4a354 (patch)
tree68f9f5399bc64bf7fe87dae16d8cc287717208bf /lib
parent3fa8749e584b55f1180411ab1b51117190bac1e5 (diff)
downloadconfigs-1f7c14c62ce63805f9574664a6c6de3633d4a354.tar.gz
percpu counter: clean up percpu_counter_sum_and_set()
percpu_counter_sum_and_set() and percpu_counter_sum() is the same except the former updates the global counter after accounting. Since we are taking the fbc->lock to calculate the precise value of the counter in percpu_counter_sum() anyway, it should simply set fbc->count too, as the percpu_counter_sum_and_set() does. This patch merges these two interfaces into one. Signed-off-by: Mingming Cao <cmm@us.ibm.com> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: <linux-ext4@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'lib')
-rw-r--r--lib/percpu_counter.c8
1 files changed, 3 insertions, 5 deletions
diff --git a/lib/percpu_counter.c b/lib/percpu_counter.c
index 4a8ba4bf5f6..a8663890a88 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;
@@ -62,11 +62,9 @@ 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;
+ *pcount = 0;
}
- if (set)
- fbc->count = ret;
+ fbc->count = ret;
spin_unlock(&fbc->lock);
return ret;