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percpu counter: clean up percpu_counter_sum_and_set()

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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 <[email protected]>
Acked-by: Peter Zijlstra <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: "Theodore Ts'o" <[email protected]>
This commit is contained in:
Mingming Cao 2008-10-09 12:50:59 -04:00 • committed by Theodore Ts'o
commit 1f7c14c62c
3 changed files with 7 additions and 15 deletions
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8
lib/percpu_counter.c
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@ -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;