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Message-ID: <CAAmzW4PDmL-1U6SVFohS_du-7uJngbR-4EBa4UUSWa-xs66Lmw@mail.gmail.com> 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. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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