5.4-stable review patch. If anyone has any objections, please let me know.
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From: linke li lilinke99@qq.com
[ 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@qq.com Link: https://lore.kernel.org/r/tencent_5E187BD0A61BA28605E85405F15228254D0A@qq.co... Reviewed-by: Jan Kara jack@suse.cz Signed-off-by: Christian Brauner brauner@kernel.org Stable-dep-of: aabfe57ebaa7 ("vfs: don't mod negative dentry count when on shrinker list") Signed-off-by: Sasha Levin sashal@kernel.org --- fs/dcache.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/dcache.c b/fs/dcache.c index 43864a276faa2..9505e5df30b74 100644 --- a/fs/dcache.c +++ b/fs/dcache.c @@ -329,7 +329,7 @@ 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); }