linux-kernel - [PATCH] [2/16] HWPOISON: Export poison flag in /proc/kpageflags

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Message-Id: <20090527201227.EAEC41D0286@basil.firstfloor.org>
Date:	Wed, 27 May 2009 22:12:27 +0200 (CEST)
From:	Andi Kleen <andi@...stfloor.org>
To:	fengguang.wu@...el.com, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	fengguang.wu@...el.com
Subject: [PATCH] [2/16] HWPOISON: Export poison flag in /proc/kpageflags


From: Fengguang Wu <fengguang.wu@...el.com>

Export the new poison flag in /proc/kpageflags. Poisoned pages are moderately
interesting even for administrators, so export them here. Also useful
for debugging.

AK: I extracted this out of a larger patch from Fengguang Wu.

Signed-off-by: Andi Kleen <ak@...ux.intel.com>

---
 fs/proc/page.c |    4 ++++
 1 file changed, 4 insertions(+)

Index: linux/fs/proc/page.c
===================================================================
--- linux.orig/fs/proc/page.c	2009-05-27 21:13:54.000000000 +0200
+++ linux/fs/proc/page.c	2009-05-27 21:14:21.000000000 +0200
@@ -79,6 +79,7 @@
 #define KPF_WRITEBACK  8
 #define KPF_RECLAIM    9
 #define KPF_BUDDY     10
+#define KPF_HWPOISON  11
 
 #define kpf_copy_bit(flags, dstpos, srcpos) (((flags >> srcpos) & 1) << dstpos)
 
@@ -118,6 +119,9 @@
 			kpf_copy_bit(kflags, KPF_WRITEBACK, PG_writeback) |
 			kpf_copy_bit(kflags, KPF_RECLAIM, PG_reclaim) |
 			kpf_copy_bit(kflags, KPF_BUDDY, PG_buddy);
+#ifdef CONFIG_MEMORY_FAILURE
+		uflags |= kpf_copy_bit(kflags, KPF_HWPOISON, PG_hwpoison);
+#endif
 
 		if (put_user(uflags, out++)) {
 			ret = -EFAULT;
--
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