linux-kernel - Re: [PATCH 2/4] mm/rmap: convert anon_vma rwsem to rwlock

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Message-ID: <20131101084605.GC19466@laptop.lan>
Date:	Fri, 1 Nov 2013 09:46:05 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Yuanhan Liu <yuanhan.liu@...ux.intel.com>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>,
	Michel Lespinasse <walken@...gle.com>
Subject: Re: [PATCH 2/4] mm/rmap: convert anon_vma rwsem to rwlock_t

On Fri, Nov 01, 2013 at 03:54:25PM +0800, Yuanhan Liu wrote:
> --- a/mm/mmap.c
> +++ b/mm/mmap.c
> @@ -2955,15 +2955,15 @@ static void vm_lock_anon_vma(struct mm_struct *mm, struct anon_vma *anon_vma)
>  		 * The LSB of head.next can't change from under us
>  		 * because we hold the mm_all_locks_mutex.
>  		 */
> -		down_write_nest_lock(&anon_vma->rwsem, &mm->mmap_sem);
> +		write_lock(&anon_vma->rwlock);

You lost:

  http://marc.info/?l=linux-kernel&m=138054148402109
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