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| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2007-10-17 08:25:44 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-10-17 17:42:44 +0200 |
| commit | 3a587f47b82f96f19318c036e7b979fcd5c3848f (patch) | |
| tree | 84b3254a7ea7524784f7e262d651cc332b3b0063 | |
| parent | lib: make percpu_counter_add take s64 (diff) | |
| download | linux-3a587f47b82f96f19318c036e7b979fcd5c3848f.tar.xz linux-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>
| -rw-r--r-- | include/linux/percpu_counter.h | 6 | ||||
| -rw-r--r-- | lib/percpu_counter.c | 14 |
2 files changed, 20 insertions, 0 deletions
diff --git a/include/linux/percpu_counter.h b/include/linux/percpu_counter.h index e8fa2da13ba6..2da92e8ce3dd 100644 --- a/include/linux/percpu_counter.h +++ b/include/linux/percpu_counter.h @@ -32,6 +32,7 @@ struct percpu_counter { void percpu_counter_init(struct percpu_counter *fbc, s64 amount); void percpu_counter_destroy(struct percpu_counter *fbc); +void percpu_counter_set(struct percpu_counter *fbc, s64 amount); void __percpu_counter_add(struct percpu_counter *fbc, s64 amount, s32 batch); s64 percpu_counter_sum(struct percpu_counter *fbc); @@ -75,6 +76,11 @@ static inline void percpu_counter_destroy(struct percpu_counter *fbc) { } +static inline void percpu_counter_set(struct percpu_counter *fbc, s64 amount) +{ + fbc->count = amount; +} + #define __percpu_counter_add(fbc, amount, batch) \ percpu_counter_add(fbc, amount) 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; |