linux-kernel - Re: [COUNTERPATCH] mm: avoid overflowing preempt_count() in mmu_take_all

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Message-ID: <4BB487D5.7010803@redhat.com>
Date:	Thu, 01 Apr 2010 14:47:33 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Thomas Gleixner <tglx@...utronix.de>,
	Rik van Riel <riel@...hat.com>, linux-kernel@...r.kernel.org,
	aarcange@...hat.com, akpm@...ux-foundation.org,
	Kent Overstreet <kent.overstreet@...il.com>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [COUNTERPATCH] mm: avoid overflowing preempt_count() in mmu_take_all_locks()

On 04/01/2010 02:43 PM, Peter Zijlstra wrote:
> On Thu, 2010-04-01 at 13:27 +0200, Peter Zijlstra wrote:
>    
>> I've almost got a patch done that converts those two, still need to look
>> where that tasklist_lock muck happens.
>>      
> OK, so the below builds and boots, only need to track down that
> tasklist_lock nesting, but I got to run an errand first.
>
> --- a/mm/ksm.c
> +++ b/mm/ksm.c
> @@ -327,7 +327,7 @@ static void drop_anon_vma(struct rmap_item *rmap_item)
>
>   	if (atomic_dec_and_lock(&anon_vma->ksm_refcount,&anon_vma->lock)) {
>   		int empty = list_empty(&anon_vma->head);
> -		spin_unlock(&anon_vma->lock);
> +		mutex_unlock(&anon_vma->lock);
>   		if (empty)
>   			anon_vma_free(anon_vma);
>   	}
>    

You need to convert the atomic_dec_and_lock() as well.


-- 
error compiling committee.c: too many arguments to function

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