diff options
Diffstat (limited to 'include/linux/rmap.h')
| -rw-r--r-- | include/linux/rmap.h | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/include/linux/rmap.h b/include/linux/rmap.h index d25bd224d370..567d43f29a10 100644 --- a/include/linux/rmap.h +++ b/include/linux/rmap.h @@ -29,6 +29,9 @@ struct anon_vma { #ifdef CONFIG_KSM atomic_t ksm_refcount; #endif +#ifdef CONFIG_MIGRATION + atomic_t migrate_refcount; +#endif /* * NOTE: the LSB of the head.next is set by * mm_take_all_locks() _after_ taking the above lock. So the @@ -81,6 +84,26 @@ static inline int ksm_refcount(struct anon_vma *anon_vma) return 0; } #endif /* CONFIG_KSM */ +#ifdef CONFIG_MIGRATION +static inline void migrate_refcount_init(struct anon_vma *anon_vma) +{ + atomic_set(&anon_vma->migrate_refcount, 0); +} + +static inline int migrate_refcount(struct anon_vma *anon_vma) +{ + return atomic_read(&anon_vma->migrate_refcount); +} +#else +static inline void migrate_refcount_init(struct anon_vma *anon_vma) +{ +} + +static inline int migrate_refcount(struct anon_vma *anon_vma) +{ + return 0; +} +#endif /* CONFIG_MIGRATE */ static inline struct anon_vma *page_anon_vma(struct page *page) { |