linux-kernel - Re: [PATCH] nilfs2: fix hang problem after bio

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Date:	Sun, 21 Jun 2009 13:08:43 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Ryusuke Konishi <konishi.ryusuke@....ntt.co.jp>
cc:	linux-kernel@...r.kernel.org, users@...fs.org
Subject: Re: [PATCH] nilfs2: fix hang problem after bio_alloc() failed

Ryusuke Konishi <konishi.ryusuke@....ntt.co.jp> writes:
>  
> diff --git a/fs/nilfs2/segment.c b/fs/nilfs2/segment.c
> index 22c7f65..e8f188b 100644
> --- a/fs/nilfs2/segment.c
> +++ b/fs/nilfs2/segment.c
> @@ -1846,26 +1846,13 @@ static int nilfs_segctor_write(struct nilfs_sc_info *sci,
>  		err = nilfs_segbuf_write(segbuf, &wi);
>  
>  		res = nilfs_segbuf_wait(segbuf, &wi);
> -		err = unlikely(err) ? : res;
> +		err = unlikely(err) ? err : res;

It's very dubious gcc does anything with unlikely here anyways.
They typically only work directly in conditions being tested.

>  		if (unlikely(err))
>  			return err;

Also gcc generally considers conditions to blocks that
return unlikely, so it's actually superfluous.

-Andi
-- 
ak@...ux.intel.com -- Speaking for myself only.
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