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authorHuang Ying <ying.huang@intel.com>2021-06-29 05:37:16 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2021-06-29 20:53:49 +0300
commiteea4a5011ae520c98d0a14474ecde44f29659861 (patch)
tree2f10ab099dbacfe6f68b953cd8d5e6910cfcfbb7 /mm/swap_state.c
parentf4c4a3f48480730214c4f02ffa480f6bf5b0718f (diff)
downloadlinux-eea4a5011ae520c98d0a14474ecde44f29659861.tar.xz
swap: check mapping_empty() for swap cache before being freed
To check whether all pages and shadow entries in swap cache has been removed before swap cache is freed. Link: https://lkml.kernel.org/r/20210608005121.511140-1-ying.huang@intel.com Signed-off-by: "Huang, Ying" <ying.huang@intel.com> Cc: Miaohe Lin <linmiaohe@huawei.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: Minchan Kim <minchan@kernel.org> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Hugh Dickins <hughd@google.com> Cc: Mel Gorman <mgorman@techsingularity.net> Cc: Michal Hocko <mhocko@kernel.org> Cc: Dan Williams <dan.j.williams@intel.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Ilya Dryomov <idryomov@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/swap_state.c')
-rw-r--r--mm/swap_state.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/mm/swap_state.c b/mm/swap_state.c
index 4f8a912ff692..c56aa9ac050d 100644
--- a/mm/swap_state.c
+++ b/mm/swap_state.c
@@ -693,7 +693,12 @@ int init_swap_address_space(unsigned int type, unsigned long nr_pages)
void exit_swap_address_space(unsigned int type)
{
- kvfree(swapper_spaces[type]);
+ int i;
+ struct address_space *spaces = swapper_spaces[type];
+
+ for (i = 0; i < nr_swapper_spaces[type]; i++)
+ VM_WARN_ON_ONCE(!mapping_empty(&spaces[i]));
+ kvfree(spaces);
nr_swapper_spaces[type] = 0;
swapper_spaces[type] = NULL;
}