[PATCH 5.15 081/144] fs/dcache: Re-use value stored to dentry->d_flags instead of re-reading

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5.15-stable review patch.  If anyone has any objections, please let me know.

------------------

From: linke li <lilinke99@xxxxxx>

[ Upstream commit 8bfb40be31ddea0cb4664b352e1797cfe6c91976 ]

Currently, the __d_clear_type_and_inode() writes the value flags to
dentry->d_flags, then immediately re-reads it in order to use it in a if
statement. This re-read is useless because no other update to
dentry->d_flags can occur at this point.

This commit therefore re-use flags in the if statement instead of
re-reading dentry->d_flags.

Signed-off-by: linke li <lilinke99@xxxxxx>
Link: https://lore.kernel.org/r/tencent_5E187BD0A61BA28605E85405F15228254D0A@xxxxxx
Reviewed-by: Jan Kara <jack@xxxxxxx>
Signed-off-by: Christian Brauner <brauner@xxxxxxxxxx>
Stable-dep-of: aabfe57ebaa7 ("vfs: don't mod negative dentry count when on shrinker list")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 fs/dcache.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/dcache.c b/fs/dcache.c
index 422c440b492a5..f2ff73fe2b619 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -331,7 +331,7 @@ static inline void __d_clear_type_and_inode(struct dentry *dentry)
 	flags &= ~(DCACHE_ENTRY_TYPE | DCACHE_FALLTHRU);
 	WRITE_ONCE(dentry->d_flags, flags);
 	dentry->d_inode = NULL;
-	if (dentry->d_flags & DCACHE_LRU_LIST)
+	if (flags & DCACHE_LRU_LIST)
 		this_cpu_inc(nr_dentry_negative);
 }
 
-- 
2.43.0







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