Messages in this thread Patch in this message | | | Date | Thu, 14 Apr 2011 10:04:48 +0800 | From | shaohua.li@intel ... | Subject | [patch v3 1/3] 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().
Signed-off-by: Shaohua Li <shaohua.li@intel.com>
--- include/linux/percpu_counter.h | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)
Index: linux/include/linux/percpu_counter.h =================================================================== --- linux.orig/include/linux/percpu_counter.h 2011-04-13 16:09:22.000000000 +0800 +++ linux/include/linux/percpu_counter.h 2011-04-14 08:50:45.000000000 +0800 @@ -75,7 +75,7 @@ static inline s64 percpu_counter_read_po 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(st return fbc->count; } +/* + * percpu_counter is intended to track positive number. In UP case, the number + * should never be negative. + */ static inline s64 percpu_counter_read_positive(struct percpu_counter *fbc) { return fbc->count;
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