This is a note to let you know that I've just added the patch titled
seqlock,lockdep: Fix seqcount_latch_init()
to the 5.11-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
seqlock-lockdep-fix-seqcount_latch_init.patch
and it can be found in the queue-5.11 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 14b1d75bc04780a166734b9b6e53beb7e5e00d14
Author: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Date: Tue Mar 9 15:21:18 2021 +0100
seqlock,lockdep: Fix seqcount_latch_init()
[ Upstream commit 4817a52b306136c8b2b2271d8770401441e4cf79 ]
seqcount_init() must be a macro in order to preserve the static
variable that is used for the lockdep key. Don't then wrap it in an
inline function, which destroys that.
Luckily there aren't many users of this function, but fix it before it
becomes a problem.
Fixes: 80793c3471d9 ("seqlock: Introduce seqcount_latch_t")
Reported-by: Eric Dumazet <eric.dumazet@xxxxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Link: https://lkml.kernel.org/r/YEeFEbNUVkZaXDp4@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/include/linux/seqlock.h b/include/linux/seqlock.h
index 2f7bb92b4c9e..f61e34fbaaea 100644
--- a/include/linux/seqlock.h
+++ b/include/linux/seqlock.h
@@ -664,10 +664,7 @@ typedef struct {
* seqcount_latch_init() - runtime initializer for seqcount_latch_t
* @s: Pointer to the seqcount_latch_t instance
*/
-static inline void seqcount_latch_init(seqcount_latch_t *s)
-{
- seqcount_init(&s->seqcount);
-}
+#define seqcount_latch_init(s) seqcount_init(&(s)->seqcount)
/**
* raw_read_seqcount_latch() - pick even/odd latch data copy
