linux-kernel - Re: [git pull] core kernel fixes

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Date:	Mon, 30 Jun 2008 21:46:55 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Vegard Nossum <vegard.nossum@...il.com>
cc:	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Daniel J Blueman <daniel.blueman@...il.com>
Subject: Re: [git pull] core kernel fixes

On Mon, 30 Jun 2008, Vegard Nossum wrote:
> On Mon, Jun 30, 2008 at 8:20 PM, Ingo Molnar <mingo@...e.hu> wrote:
> > The patch was tested with our standard tests so it's certainly good in
> > practice - but i havent specifically tried your testcase (maybe Thomas
> > has). Can you see any problem with the fix?
> 
> Well, what I can see is that the patch that was committed has some
> missing changes. In Daniel's patch:
> 
> -repeat:
> -	spin_lock(&pool_lock);
> +	spin_lock_irqsave(&pool_lock, flags);
>  	if (obj_pool.first) {
>  		obj	    = hlist_entry(obj_pool.first, typeof(*obj), node);
> 
> The patch that was committed:
> 
> -repeat:
>         spin_lock(&pool_lock);
>         if (obj_pool.first) {
>                 obj         = hlist_entry(obj_pool.first, typeof(*obj), node);
> 
> Was it not necessary to make the pool lock irq-safe in this place?
> 
> For reference:
> 
> Daniel's patch: http://lkml.org/lkml/2008/6/15/27
> Actual commit: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=70c85057e0bde35eb56352a293ecb5d1641a0334;hp=e6100f23375c0c71ce595d04551fa6553b611918

alloc_object() is called with interrupts disabled from __debug_object_init()

Thanks,
	tglx
 
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