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mm/swap: optimise get_shadow_from_swap_cache

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There's no need to get a reference to the page, just load the entry and
see if it's a shadow entry.

Link: https://lkml.kernel.org/r/20201112212641.27837-4-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Cc: Dave Chinner <dchinner@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: William Kucharski <william.kucharski@oracle.com>
Cc: Yang Shi <yang.shi@linux.alibaba.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Matthew Wilcox (Oracle) 2021-02-25 17:15:33 -08:00 committed by Linus Torvalds
parent 96888e0ab0
commit 8c647dd1e3
1 changed files with 1 additions and 3 deletions
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4
mm/swap_state.c
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@ -87,11 +87,9 @@ void *get_shadow_from_swap_cache(swp_entry_t entry)
pgoff_t idx = swp_offset(entry);
struct page *page;
page = find_get_entry(address_space, idx);
page = xa_load(&address_space->i_pages, idx);
if (xa_is_value(page))
return page;
if (page)
put_page(page);
return NULL;
}