diff options
Diffstat (limited to 'mm/rmap.c')
| -rw-r--r-- | mm/rmap.c | 27 |
1 files changed, 20 insertions, 7 deletions
diff --git a/mm/rmap.c b/mm/rmap.c index 669acb22b572..59da5b734c80 100644 --- a/mm/rmap.c +++ b/mm/rmap.c @@ -183,7 +183,7 @@ void __init anon_vma_init(void) */ static struct anon_vma *page_lock_anon_vma(struct page *page) { - struct anon_vma *anon_vma = NULL; + struct anon_vma *anon_vma; unsigned long anon_mapping; rcu_read_lock(); @@ -195,9 +195,16 @@ static struct anon_vma *page_lock_anon_vma(struct page *page) anon_vma = (struct anon_vma *) (anon_mapping - PAGE_MAPPING_ANON); spin_lock(&anon_vma->lock); + return anon_vma; out: rcu_read_unlock(); - return anon_vma; + return NULL; +} + +static void page_unlock_anon_vma(struct anon_vma *anon_vma) +{ + spin_unlock(&anon_vma->lock); + rcu_read_unlock(); } /* @@ -333,7 +340,8 @@ static int page_referenced_anon(struct page *page) if (!mapcount) break; } - spin_unlock(&anon_vma->lock); + + page_unlock_anon_vma(anon_vma); return referenced; } @@ -490,9 +498,11 @@ int page_mkclean(struct page *page) struct address_space *mapping = page_mapping(page); if (mapping) ret = page_mkclean_file(mapping, page); + if (page_test_dirty(page)) { + page_clear_dirty(page); + ret = 1; + } } - if (page_test_and_clear_dirty(page)) - ret = 1; return ret; } @@ -597,8 +607,10 @@ void page_remove_rmap(struct page *page, struct vm_area_struct *vma) * Leaving it set also helps swapoff to reinstate ptes * faster for those pages still in swapcache. */ - if (page_test_and_clear_dirty(page)) + if (page_test_dirty(page)) { + page_clear_dirty(page); set_page_dirty(page); + } __dec_zone_page_state(page, PageAnon(page) ? NR_ANON_PAGES : NR_FILE_MAPPED); } @@ -802,7 +814,8 @@ static int try_to_unmap_anon(struct page *page, int migration) if (ret == SWAP_FAIL || !page_mapped(page)) break; } - spin_unlock(&anon_vma->lock); + + page_unlock_anon_vma(anon_vma); return ret; } |