linux-kernel - Re: [RFC] jffs2: use cond_resched() instead of yield()

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Message-ID: <1283366151.2209.21.camel@brekeke>
Date:	Wed, 01 Sep 2010 21:35:51 +0300
From:	Artem Bityutskiy <dedekind1@...il.com>
To:	Wolfram Sang <w.sang@...gutronix.de>
Cc:	linux-kernel@...r.kernel.org, linux-mtd@...ts.infradead.org,
	Artem Bityutskiy <Artem.Bityutskiy@...ia.com>,
	Ingo Molnar <mingo@...e.hu>, dwmw2@...radead.org
Subject: Re: [RFC] jffs2: use cond_resched() instead of yield()

This 'yield()' was introduced by dwmw2, so he may have strong feelings
about it. CCed.

On Wed, 2010-09-01 at 18:03 +0200, Wolfram Sang wrote:
> yield() has different semantics meanwhile and even causes RT-kernels to
> BUG. Replace the only appearance left in jffs2.
> 
> Signed-off-by: Wolfram Sang <w.sang@...gutronix.de>
> Cc: Artem Bityutskiy <Artem.Bityutskiy@...ia.com>
> Cc: Ingo Molnar <mingo@...e.hu>
> ---
> 
> The aforementioned BUG() showed up in one of our customer's RT-projects. While
> this could be handled by rearranging his thread-priorities, I wondered if such
> a patch would be worthwhile, still. Reading through the material covering
> yield() and related replacements, I believe this patch should be appropriate.
> Please say if I missed some side-effects.
> 
>  fs/jffs2/erase.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/fs/jffs2/erase.c b/fs/jffs2/erase.c
> index abac961..e513f19 100644
> --- a/fs/jffs2/erase.c
> +++ b/fs/jffs2/erase.c
> @@ -151,7 +151,7 @@ int jffs2_erase_pending_blocks(struct jffs2_sb_info *c, int count)
>  		}
>  
>  		/* Be nice */
> -		yield();
> +		cond_resched();
>  		mutex_lock(&c->erase_free_sem);
>  		spin_lock(&c->erase_completion_lock);
>  	}

-- 
Best Regards,
Artem Bityutskiy (Битюцкий Артём)

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