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mm/swapfile:__swap_duplicate: drop redundant WRITE_ONCE on swap_map for err cases

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The code is quite hard to read, we are still writing swap_map after
errors happen. Though the written value is as before,

 has_cache = count & SWAP_HAS_CACHE;
 count &= ~SWAP_HAS_CACHE;
 [snipped]
 WRITE_ONCE(p->swap_map[offset], count | has_cache);

It would be better to entirely drop the WRITE_ONCE for both
performance and readability.

[akpm@linux-foundation.org: avoid using goto]
Link: https://lkml.kernel.org/r/20240221091028.123122-1-21cnbao@gmail.com
Signed-off-by: Barry Song <v-songbaohua@oppo.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Barry Song 2024-02-21 22:10:28 +13:00 committed by Andrew Morton
parent b4d3de57ca
commit e26f0b939d
1 changed files with 2 additions and 1 deletions
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mm/swapfile.c
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@ -3335,7 +3335,8 @@ static int __swap_duplicate(swp_entry_t entry, unsigned char usage)
} else
err = -ENOENT; /* unused swap entry */
WRITE_ONCE(p->swap_map[offset], count | has_cache);
if (!err)
WRITE_ONCE(p->swap_map[offset], count | has_cache);
unlock_out:
unlock_cluster_or_swap_info(p, ci);