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authorMatthew Wilcox (Oracle) <willy@infradead.org>2021-02-26 04:15:33 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2021-02-26 20:40:59 +0300
commit8c647dd1e39573f23a4ca25c09f82716b70e702c (patch)
treec15c1ce8efa944dfbe899e423b4c20f84d385df4 /mm
parent96888e0ab0e652eb3036eff0cb0664a96cb7e9a9 (diff)
downloadlinux-8c647dd1e39573f23a4ca25c09f82716b70e702c.tar.xz
mm/swap: optimise get_shadow_from_swap_cache
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>
Diffstat (limited to 'mm')
-rw-r--r--mm/swap_state.c4
1 files changed, 1 insertions, 3 deletions
diff --git a/mm/swap_state.c b/mm/swap_state.c
index c1a648d9092b..f270c30d4681 100644
--- a/mm/swap_state.c
+++ b/mm/swap_state.c
@@ -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;
}