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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>
This commit is contained in:
Huang Ying 2021-06-28 19:37:16 -07:00 committed by Linus Torvalds
parent f4c4a3f484
commit eea4a5011a
1 changed files with 6 additions and 1 deletions
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7
mm/swap_state.c
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@ -693,7 +693,12 @@ int init_swap_address_space(unsigned int type, unsigned long nr_pages)
void exit_swap_address_space(unsigned int type) 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; nr_swapper_spaces[type] = 0;
swapper_spaces[type] = NULL; swapper_spaces[type] = NULL;
} }