From: Wu Fengguang <fengguang.wu@intel.com>
Date: Wed, 16 Dec 2009 11:19:58 +0000 (+0100)
Subject: HWPOISON: comment dirty swapcache pages
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=71f72525dfaaec012e23089c73331654ea7b12d3;p=linux-beck.git

HWPOISON: comment dirty swapcache pages

AK: Improve comment

Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
---

diff --git a/mm/memory.c b/mm/memory.c
index a54b2c498444..db09106ed44b 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -2553,6 +2553,10 @@ static int do_swap_page(struct mm_struct *mm, struct vm_area_struct *vma,
 		ret = VM_FAULT_MAJOR;
 		count_vm_event(PGMAJFAULT);
 	} else if (PageHWPoison(page)) {
+		/*
+		 * hwpoisoned dirty swapcache pages are kept for killing
+		 * owner processes (which may be unknown at hwpoison time)
+		 */
 		ret = VM_FAULT_HWPOISON;
 		delayacct_clear_flag(DELAYACCT_PF_SWAPIN);
 		goto out_release;