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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2007-10-16 23:25:44 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-17 08:42:44 -0700
commit3a587f47b82f96f19318c036e7b979fcd5c3848f (patch)
tree84b3254a7ea7524784f7e262d651cc332b3b0063
parent20e89767096392a2cb2404437d3d181b8827af38 (diff)
downloadop-kernel-dev-3a587f47b82f96f19318c036e7b979fcd5c3848f.zip
op-kernel-dev-3a587f47b82f96f19318c036e7b979fcd5c3848f.tar.gz
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.h6
-rw-r--r--lib/percpu_counter.c14
2 files changed, 20 insertions, 0 deletions
diff --git a/include/linux/percpu_counter.h b/include/linux/percpu_counter.h
index e8fa2da..2da92e8 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 f7ac68c..c9708db 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;
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