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 a54b2c498444dca8d8b41bb59d65640915f1a684..db09106ed44b7a4aa46d058c76d89a84d1322b42 100644 (file)
--- 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;