From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755878AbZIKSsb (ORCPT ); Fri, 11 Sep 2009 14:48:31 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755758AbZIKSsa (ORCPT ); Fri, 11 Sep 2009 14:48:30 -0400 Received: from one.firstfloor.org ([213.235.205.2]:54005 "EHLO one.firstfloor.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753387AbZIKSs3 (ORCPT ); Fri, 11 Sep 2009 14:48:29 -0400 From: Andi Kleen References: <20090911848.933193846@firstfloor.org> In-Reply-To: <20090911848.933193846@firstfloor.org> To: linux-kernel@vger.kernel.org Subject: [PATCH] [1/21] HWPOISON: Add page flag for poisoned pages Message-Id: <20090911184830.0C3D3B1757@basil.firstfloor.org> Date: Fri, 11 Sep 2009 20:48:30 +0200 (CEST) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hardware poisoned pages need special handling in the VM and shouldn't be touched again. This requires a new page flag. Define it here. The page flags wars seem to be over, so it shouldn't be a problem to get a new one. v2: Add TestSetHWPoison (suggested by Johannes Weiner) Acked-by: Christoph Lameter Signed-off-by: Andi Kleen --- include/linux/page-flags.h | 17 ++++++++++++++++- 1 file changed, 16 insertions(+), 1 deletion(-) Index: linux/include/linux/page-flags.h =================================================================== --- linux.orig/include/linux/page-flags.h +++ linux/include/linux/page-flags.h @@ -51,6 +51,9 @@ * PG_buddy is set to indicate that the page is free and in the buddy system * (see mm/page_alloc.c). * + * PG_hwpoison indicates that a page got corrupted in hardware and contains + * data with incorrect ECC bits that triggered a machine check. Accessing is + * not safe since it may cause another machine check. Don't touch! */ /* @@ -102,6 +105,9 @@ enum pageflags { #ifdef CONFIG_IA64_UNCACHED_ALLOCATOR PG_uncached, /* Page has been mapped as uncached */ #endif +#ifdef CONFIG_MEMORY_FAILURE + PG_hwpoison, /* hardware poisoned page. Don't touch */ +#endif __NR_PAGEFLAGS, /* Filesystems */ @@ -263,6 +269,15 @@ PAGEFLAG(Uncached, uncached) PAGEFLAG_FALSE(Uncached) #endif +#ifdef CONFIG_MEMORY_FAILURE +PAGEFLAG(HWPoison, hwpoison) +TESTSETFLAG(HWPoison, hwpoison) +#define __PG_HWPOISON (1UL << PG_hwpoison) +#else +PAGEFLAG_FALSE(HWPoison) +#define __PG_HWPOISON 0 +#endif + static inline int PageUptodate(struct page *page) { int ret = test_bit(PG_uptodate, &(page)->flags); @@ -387,7 +402,7 @@ static inline void __ClearPageTail(struc 1 << PG_private | 1 << PG_private_2 | \ 1 << PG_buddy | 1 << PG_writeback | 1 << PG_reserved | \ 1 << PG_slab | 1 << PG_swapcache | 1 << PG_active | \ - 1 << PG_unevictable | __PG_MLOCKED) + 1 << PG_unevictable | __PG_MLOCKED | __PG_HWPOISON) /* * Flags checked when a page is prepped for return by the page allocator.