linux-kernel - Re: [RFC PATCH 1/8] mm, vmalloc: change iterating a vmlist to find_vm

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Date:	Fri, 7 Dec 2012 22:40:10 +0900
From:	JoonSoo Kim <js1304@...il.com>
To:	Pekka Enberg <penberg@...nel.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Russell King <rmk+kernel@....linux.org.uk>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	kexec@...ts.infradead.org, Chris Metcalf <cmetcalf@...era.com>,
	Guan Xuetao <gxt@...c.pku.edu.cn>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [RFC PATCH 1/8] mm, vmalloc: change iterating a vmlist to find_vm_area()

Hello, Pekka.

2012/12/7 Pekka Enberg <penberg@...nel.org>:
> On Thu, Dec 6, 2012 at 6:09 PM, Joonsoo Kim <js1304@...il.com> wrote:
>> The purpose of iterating a vmlist is finding vm area with specific
>> virtual address. find_vm_area() is provided for this purpose
>> and more efficient, because it uses a rbtree.
>> So change it.
>
> You no longer take the 'vmlist_lock'. This is safe, because...?

As Bob mentioned, find_vm_area() hold a 'vmap_area_lock' during
searching a area.
When we hold a 'vmap_area_lock', area can't be removed.
So this change is safe.

Thanks.
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