Re: [PATCH v2 1/2] seqlock: Do the lockdep annotation before locking in do_write_seqcount_begin_nested()

[Tetsuo Handa]

On 2023/06/24 2:12, Sebastian Andrzej Siewior wrote:
>  include/linux/seqlock.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/include/linux/seqlock.h b/include/linux/seqlock.h
> index 3926e90279477..d778af83c8f36 100644
> --- a/include/linux/seqlock.h
> +++ b/include/linux/seqlock.h
> @@ -512,8 +512,8 @@ do {									\
>  
>  static inline void do_write_seqcount_begin_nested(seqcount_t *s, int subclass)
>  {
> -	do_raw_write_seqcount_begin(s);
>  	seqcount_acquire(&s->dep_map, subclass, 0, _RET_IP_);
> +	do_raw_write_seqcount_begin(s);
>  }
>  
>  /**

Why not to do the same on the end side?

 static inline void do_write_seqcount_end(seqcount_t *s)
 {
- 	seqcount_release(&s->dep_map, _RET_IP_);
 	do_raw_write_seqcount_end(s);
+	seqcount_release(&s->dep_map, _RET_IP_);
 }