linux-kernel - Re: [PATCH] inotify: fix minmax.cocci warnings

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Date:   Wed, 7 Apr 2021 18:05:46 +0200
From:   Jan Kara <jack@...e.cz>
To:     Julia Lawall <julia.lawall@...ia.fr>
Cc:     Jan Kara <jack@...e.cz>, Amir Goldstein <amir73il@...il.com>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        kbuild-all@...ts.01.org, Denis Efremov <efremov@...ux.com>
Subject: Re: [PATCH] inotify: fix minmax.cocci warnings

On Tue 06-04-21 22:49:26, Julia Lawall wrote:
> From: kernel test robot <lkp@...el.com>
> 
> Opportunity for min().
> 
> Generated by: scripts/coccinelle/misc/minmax.cocci
> 
> Fixes: 8636e3295ce3 ("coccinelle: misc: add minmax script")
> CC: Denis Efremov <efremov@...ux.com>
> Reported-by: kernel test robot <lkp@...el.com>
> Signed-off-by: kernel test robot <lkp@...el.com>
> Signed-off-by: Julia Lawall <julia.lawall@...ia.fr>
...
> --- a/fs/notify/inotify/inotify_user.c
> +++ b/fs/notify/inotify/inotify_user.c
> @@ -382,7 +382,7 @@ static int inotify_add_to_idr(struct idr
> 
>  	spin_unlock(idr_lock);
>  	idr_preload_end();
> -	return ret < 0 ? ret : 0;
> +	return min(ret, 0);
>  }

Honestly, while previous expression is a standard idiom for "if 'ret' holds
an error, return it", the new expression is harder to understand for me. So
I prefer to keep things as they are in this particular case...

								Honza
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR