[PATCH] [10/31] HWPOISON: comment dirty swapcache pages

[Andi Kleen]

From: Wu Fengguang <fengguang.wu@xxxxxxxxx>

AK: Improve comment

Signed-off-by: Wu Fengguang <fengguang.wu@xxxxxxxxx>
Signed-off-by: Andi Kleen <ak@xxxxxxxxxxxxxxx>

---
 mm/memory.c |    4 ++++
 1 file changed, 4 insertions(+)

Index: linux/mm/memory.c
===================================================================
--- linux.orig/mm/memory.c
+++ linux/mm/memory.c
@@ -2540,6 +2540,10 @@ static int do_swap_page(struct mm_struct
 		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;
--
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