Commit eea4a501 authored by Huang Ying's avatar Huang Ying Committed by Linus Torvalds
Browse files

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: default avatar"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: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent f4c4a3f4

mm/swap_state.c

+6 −1
Original line number Diff line number Diff line
@@ -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;

}