linux-kernel - Re: [PATCH] futex: no need to check return value of debugfs

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Date:   Sat, 26 Jan 2019 12:25:34 -0800
From:   Darren Hart <dvhart@...radead.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH] futex: no need to check return value of debugfs_create
 functions

On Tue, Jan 22, 2019 at 04:21:39PM +0100, Greg Kroah-Hartman wrote:
> When calling debugfs functions, there is no need to ever check the
> return value.  The function can work or not, but the code logic should
> never do something different based on this.
> 
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Darren Hart <dvhart@...radead.org>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

As documented, and futexes can't be modules, so no need to check for the dentry.

Reviewed-by: Darren Hart (VMware) <dvhart@...radead.org>



> ---
>  kernel/futex.c | 8 ++------
>  1 file changed, 2 insertions(+), 6 deletions(-)
> 
> diff --git a/kernel/futex.c b/kernel/futex.c
> index be3bff2315ff..c2ed57b084a4 100644
> --- a/kernel/futex.c
> +++ b/kernel/futex.c
> @@ -321,12 +321,8 @@ static int __init fail_futex_debugfs(void)
>  	if (IS_ERR(dir))
>  		return PTR_ERR(dir);
>  
> -	if (!debugfs_create_bool("ignore-private", mode, dir,
> -				 &fail_futex.ignore_private)) {
> -		debugfs_remove_recursive(dir);
> -		return -ENOMEM;
> -	}
> -
> +	debugfs_create_bool("ignore-private", mode, dir,
> +			    &fail_futex.ignore_private);
>  	return 0;
>  }
>  
> -- 
> 2.20.1
> 
> 

-- 
Darren Hart
VMware Open Source Technology Center