linux-kernel - Re: [announce] "kill the Big Kernel Lock (BKL)" tree

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Date:	Wed, 14 May 2008 22:05:59 +0200
From:	Frederik Deweerdt <deweerdt@...e.fr>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Thomas Gleixner <tglx@...utronix.de>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Alexander Viro <viro@....linux.org.uk>
Subject: Re: [announce] "kill the Big Kernel Lock (BKL)" tree

Hi Ingo,
On Wed, May 14, 2008 at 09:41:22PM +0200, Ingo Molnar wrote:
> Subject: remove bkl: reiserfs fix
> From: Ingo Molnar <mingo@...e.hu>
> Date: Wed May 14 16:26:36 CEST 2008
> 
> avoid j_commit_lock deadlock. Since the down() can block it is
> safe to drop the BKL here.
> 
> Signed-off-by: Ingo Molnar <mingo@...e.hu>
> ---
>  fs/reiserfs/journal.c |    2 ++
>  fs/super.c            |    2 ++
>  2 files changed, 4 insertions(+)
> 
> Index: linux/fs/reiserfs/journal.c
> ===================================================================
> --- linux.orig/fs/reiserfs/journal.c
> +++ linux/fs/reiserfs/journal.c
> @@ -1044,8 +1044,10 @@ static int flush_commit_list(struct supe
>  		}
>  	}
>  
> +//	unlock_kernel();
 ^^^^
>  	/* make sure nobody is trying to flush this one at the same time */
>  	down(&jl->j_commit_lock);
> +//	lock_kernel();
 ^^^^
>  	if (!journal_list_still_alive(s, trans_id)) {
>  		up(&jl->j_commit_lock);
>  		goto put_jl;
Must be a typo?

Regards,
Frederik
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