linux-kernel - Re: [PATCH 3/3] fs: __fget_light() can use _

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Message-ID: <20140113233720.GS10038@linux.vnet.ibm.com>
Date:	Mon, 13 Jan 2014 15:37:20 -0800
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Al Viro <viro@...IV.linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Dipankar Sarma <dipankar@...ibm.com>,
	Eric Dumazet <edumazet@...gle.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] fs: __fget_light() can use __fget() in slow path

On Mon, Jan 13, 2014 at 04:49:06PM +0100, Oleg Nesterov wrote:
> The slow path in __fget_light() can use __fget() to avoid the
> code duplication. Saves 232 bytes.
> 
> Signed-off-by: Oleg Nesterov <oleg@...hat.com>

Reviewed-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>

> ---
>  fs/file.c |   14 +++-----------
>  1 files changed, 3 insertions(+), 11 deletions(-)
> 
> diff --git a/fs/file.c b/fs/file.c
> index 50c1208..771578b 100644
> --- a/fs/file.c
> +++ b/fs/file.c
> @@ -694,17 +694,9 @@ struct file *__fget_light(unsigned int fd, fmode_t mask, int *fput_needed)
>  		if (file && (file->f_mode & mask))
>  			file = NULL;
>  	} else {
> -		rcu_read_lock();
> -		file = fcheck_files(files, fd);
> -		if (file) {
> -			if (!(file->f_mode & mask) &&
> -			    atomic_long_inc_not_zero(&file->f_count))
> -				*fput_needed = 1;
> -			else
> -				/* Didn't get the reference, someone's freed */
> -				file = NULL;
> -		}
> -		rcu_read_unlock();
> +		file = __fget(fd, mask);
> +		if (file)
> +			*fput_needed = 1;
>  	}
> 
>  	return file;
> -- 
> 1.5.5.1
> 
> 

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