Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756123AbZFCSsA (ORCPT ); Wed, 3 Jun 2009 14:48:00 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754346AbZFCSqx (ORCPT ); Wed, 3 Jun 2009 14:46:53 -0400 Received: from one.firstfloor.org ([213.235.205.2]:37828 "EHLO one.firstfloor.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754955AbZFCSqw (ORCPT ); Wed, 3 Jun 2009 14:46:52 -0400 From: Andi Kleen References: <20090603846.816684333@firstfloor.org> In-Reply-To: <20090603846.816684333@firstfloor.org> To: akpm@linux-foundation.org, npiggin@suse.de, linux-kernel@vger.kernel.org, linux-mm@kvack.org, fengguang.wu@intel.com Subject: [PATCH] [6/16] HWPOISON: Add various poison checks in mm/memory.c Message-Id: <20090603184639.1933B1D028F@basil.firstfloor.org> Date: Wed, 3 Jun 2009 20:46:38 +0200 (CEST) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1165 Lines: 33 Bail out early when hardware poisoned pages are found in page fault handling. Since they are poisoned they should not be mapped freshly into processes, because that would cause another (potentially deadly) machine check This is generally handled in the same way as OOM, just a different error code is returned to the architecture code. Signed-off-by: Andi Kleen --- mm/memory.c | 3 +++ 1 file changed, 3 insertions(+) Index: linux/mm/memory.c =================================================================== --- linux.orig/mm/memory.c 2009-06-03 19:36:23.000000000 +0200 +++ linux/mm/memory.c 2009-06-03 19:36:23.000000000 +0200 @@ -2797,6 +2797,9 @@ if (unlikely(ret & (VM_FAULT_ERROR | VM_FAULT_NOPAGE))) return ret; + if (unlikely(PageHWPoison(vmf.page))) + return VM_FAULT_HWPOISON; + /* * For consistency in subsequent calls, make the faulted page always * locked. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/