From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933205AbZHDVxG (ORCPT ); Tue, 4 Aug 2009 17:53:06 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S933165AbZHDVxD (ORCPT ); Tue, 4 Aug 2009 17:53:03 -0400 Received: from one.firstfloor.org ([213.235.205.2]:43931 "EHLO one.firstfloor.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933085AbZHDVxB (ORCPT ); Tue, 4 Aug 2009 17:53:01 -0400 From: Andi Kleen References: <200908041152.240876191@firstfloor.org> In-Reply-To: <200908041152.240876191@firstfloor.org> To: akpm@linux-foundation.org, linux-mm@vger.kernel.org, linux-kernel@vger.kernel.org, fengguang.wu@intel.com Subject: [PATCH] [2/15] HWPOISON: Export some rmap vma locking to outside world Message-Id: <20090804215301.43345B15D8@basil.firstfloor.org> Date: Tue, 4 Aug 2009 23:53:01 +0200 (CEST) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Needed for later patch that walks rmap entries on its own. This used to be very frowned upon, but memory-failure.c does some rather specialized rmap walking and rmap has been stable for quite some time, so I think it's ok now to export it. Signed-off-by: Andi Kleen --- include/linux/rmap.h | 6 ++++++ mm/rmap.c | 4 ++-- 2 files changed, 8 insertions(+), 2 deletions(-) Index: linux/include/linux/rmap.h =================================================================== --- linux.orig/include/linux/rmap.h +++ linux/include/linux/rmap.h @@ -112,6 +112,12 @@ int page_mkclean(struct page *); */ int try_to_munlock(struct page *); +/* + * Called by memory-failure.c to kill processes. + */ +struct anon_vma *page_lock_anon_vma(struct page *page); +void page_unlock_anon_vma(struct anon_vma *anon_vma); + #else /* !CONFIG_MMU */ #define anon_vma_init() do {} while (0) Index: linux/mm/rmap.c =================================================================== --- linux.orig/mm/rmap.c +++ linux/mm/rmap.c @@ -191,7 +191,7 @@ void __init anon_vma_init(void) * Getting a lock on a stable anon_vma from a page off the LRU is * tricky: page_lock_anon_vma rely on RCU to guard against the races. */ -static struct anon_vma *page_lock_anon_vma(struct page *page) +struct anon_vma *page_lock_anon_vma(struct page *page) { struct anon_vma *anon_vma; unsigned long anon_mapping; @@ -211,7 +211,7 @@ out: return NULL; } -static void page_unlock_anon_vma(struct anon_vma *anon_vma) +void page_unlock_anon_vma(struct anon_vma *anon_vma) { spin_unlock(&anon_vma->lock); rcu_read_unlock();