diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/mm.h | 21 |
1 files changed, 11 insertions, 10 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h index 17b27cd269c4..378bccebc26c 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -1058,19 +1058,20 @@ int __get_user_pages_fast(unsigned long start, int nr_pages, int write, /* * per-process(per-mm_struct) statistics. */ -static inline void set_mm_counter(struct mm_struct *mm, int member, long value) -{ - atomic_long_set(&mm->rss_stat.count[member], value); -} - -#if defined(SPLIT_RSS_COUNTING) -unsigned long get_mm_counter(struct mm_struct *mm, int member); -#else static inline unsigned long get_mm_counter(struct mm_struct *mm, int member) { - return atomic_long_read(&mm->rss_stat.count[member]); -} + long val = atomic_long_read(&mm->rss_stat.count[member]); + +#ifdef SPLIT_RSS_COUNTING + /* + * counter is updated in asynchronous manner and may go to minus. + * But it's never be expected number for users. + */ + if (val < 0) + val = 0; #endif + return (unsigned long)val; +} static inline void add_mm_counter(struct mm_struct *mm, int member, long value) { |