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percpu_counter: change return value and add comments

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The percpu_counter_*_positive() API in UP case doesn't check if return
value is positive.  Add comments to explain why we don't.  Also if count <
0, returns 0 instead of 1 for *read_positive().

[[email protected]: tweak comment]
Signed-off-by: Shaohua Li <[email protected]>
Acked-by: Eric Dumazet <[email protected]>
Cc: Tejun Heo <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Shaohua Li authored and Linus Torvalds committed 2011-05-25 08:39:54 -07:00
1 parent 3c8f370ded
commit c84598bbfa
1 file changed
+5 -1
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include/linux/percpu_counter.h
+5 -1
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@@ -75,7 +75,7 @@ static inline s64 percpu_counter_read_positive(struct percpu_counter *fbc)
barrier(); /* Prevent reloads of fbc->count */
if (ret >= 0)
return ret;
return 1;
return 0;
}
static inline int percpu_counter_initialized(struct percpu_counter *fbc)
@@ -133,6 +133,10 @@ static inline s64 percpu_counter_read(struct percpu_counter *fbc)
return fbc->count;
}
/*
* percpu_counter is intended to track positive numbers. In the UP case the
* number should never be negative.
*/
static inline s64 percpu_counter_read_positive(struct percpu_counter *fbc)
{
return fbc->count;