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>
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@ -693,7 +693,12 @@ int init_swap_address_space(unsigned int type, unsigned long nr_pages)
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void exit_swap_address_space(unsigned int type)
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{
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kvfree(swapper_spaces[type]);
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int i;
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struct address_space *spaces = swapper_spaces[type];
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for (i = 0; i < nr_swapper_spaces[type]; i++)
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VM_WARN_ON_ONCE(!mapping_empty(&spaces[i]));
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kvfree(spaces);
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nr_swapper_spaces[type] = 0;
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swapper_spaces[type] = NULL;
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}
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