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| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2007-10-16 23:25:44 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-10-17 08:42:44 -0700 |
| commit | 3a587f47b82f96f19318c036e7b979fcd5c3848f (patch) | |
| tree | 84b3254a7ea7524784f7e262d651cc332b3b0063 /lib/percpu_counter.c | |
| parent | 20e89767096392a2cb2404437d3d181b8827af38 (diff) | |
| download | lwn-3a587f47b82f96f19318c036e7b979fcd5c3848f.tar.gz lwn-3a587f47b82f96f19318c036e7b979fcd5c3848f.zip | |
lib: percpu_counter_set
Provide a method to set a percpu counter to a specified value.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'lib/percpu_counter.c')
| -rw-r--r-- | lib/percpu_counter.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/lib/percpu_counter.c b/lib/percpu_counter.c index f7ac68c4c375..c9708db9b8d3 100644 --- a/lib/percpu_counter.c +++ b/lib/percpu_counter.c @@ -14,6 +14,20 @@ static LIST_HEAD(percpu_counters); static DEFINE_MUTEX(percpu_counters_lock); #endif +void percpu_counter_set(struct percpu_counter *fbc, s64 amount) +{ + int cpu; + + spin_lock(&fbc->lock); + for_each_possible_cpu(cpu) { + s32 *pcount = per_cpu_ptr(fbc->counters, cpu); + *pcount = 0; + } + fbc->count = amount; + spin_unlock(&fbc->lock); +} +EXPORT_SYMBOL(percpu_counter_set); + void __percpu_counter_add(struct percpu_counter *fbc, s64 amount, s32 batch) { s64 count; |