diff options
Diffstat (limited to 'mm/swapfile.c')
| -rw-r--r-- | mm/swapfile.c | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/mm/swapfile.c b/mm/swapfile.c index 39aa9d129612..e5fd5385f0cc 100644 --- a/mm/swapfile.c +++ b/mm/swapfile.c @@ -397,18 +397,24 @@ void free_swap_and_cache(swp_entry_t entry) p = swap_info_get(entry); if (p) { - if (swap_entry_free(p, swp_offset(entry)) == 1) - page = find_trylock_page(&swapper_space, entry.val); + if (swap_entry_free(p, swp_offset(entry)) == 1) { + page = find_get_page(&swapper_space, entry.val); + if (page && unlikely(TestSetPageLocked(page))) { + page_cache_release(page); + page = NULL; + } + } spin_unlock(&swap_lock); } if (page) { int one_user; BUG_ON(PagePrivate(page)); - page_cache_get(page); one_user = (page_count(page) == 2); /* Only cache user (+us), or swap space full? Free it! */ - if (!PageWriteback(page) && (one_user || vm_swap_full())) { + /* Also recheck PageSwapCache after page is locked (above) */ + if (PageSwapCache(page) && !PageWriteback(page) && + (one_user || vm_swap_full())) { delete_from_swap_cache(page); SetPageDirty(page); } |