linux-kernel - Re: [PATCH 2/7] fsnotify: Add missing annotation for fsnotify_finish_user

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Date:   Wed, 1 Apr 2020 11:24:33 +0200
From:   Jan Kara <jack@...e.cz>
To:     Jules Irenge <jbi.octave@...il.com>
Cc:     linux-kernel@...r.kernel.org, boqun.feng@...il.com,
        Jan Kara <jack@...e.cz>, Amir Goldstein <amir73il@...il.com>,
        "open list:FSNOTIFY: FILESYSTEM NOTIFICATION INFRASTRUCTURE" 
        <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH 2/7] fsnotify: Add missing annotation for
 fsnotify_finish_user_wait()

On Tue 31-03-20 21:46:38, Jules Irenge wrote:
> Sparse reports a warning at fsnotify_finish_user_wait()
> 
> warning: context imbalance in fsnotify_finish_user_wait()
> 	- wrong count at exit
> 
> The root cause is the missing annotation at fsnotify_finish_user_wait()
> Add the missing __acquires(&fsnotify_mark_srcu) annotation.
> 
> Signed-off-by: Jules Irenge <jbi.octave@...il.com>

OK, but then fsnotify_prepare_user_wait() needs __releases annotation as
well if we're going to be serious about sparse warnings in this code?

								Honza

> ---
>  fs/notify/mark.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/fs/notify/mark.c b/fs/notify/mark.c
> index 1d96216dffd1..44fea637bb02 100644
> --- a/fs/notify/mark.c
> +++ b/fs/notify/mark.c
> @@ -350,6 +350,7 @@ bool fsnotify_prepare_user_wait(struct fsnotify_iter_info *iter_info)
>  }
>  
>  void fsnotify_finish_user_wait(struct fsnotify_iter_info *iter_info)
> +	__acquires(&fsnotify_mark_srcu)
>  {
>  	int type;
>  
> -- 
> 2.24.1
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR