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authorAndi Kleen <ak@linux.intel.com>2009-09-16 11:50:11 +0200
committerAndi Kleen <ak@linux.intel.com>2009-09-16 11:50:11 +0200
commit888b9f7c58ebe8303bad817cd554df887a683957 (patch)
treeebd01e55f5a6631a463fbb863adfbe9dcf49ad7d /mm
parentHWPOISON: Use bitmask/action code for try_to_unmap behaviour (diff)
downloadlinux-888b9f7c58ebe8303bad817cd554df887a683957.tar.xz
linux-888b9f7c58ebe8303bad817cd554df887a683957.zip
HWPOISON: Handle hardware poisoned pages in try_to_unmap
When a page has the poison bit set replace the PTE with a poison entry. This causes the right error handling to be done later when a process runs into it. v2: add a new flag to not do that (needed for the memory-failure handler later) (Fengguang) v3: remove unnecessary is_migration_entry() test (Fengguang, Minchan) Reviewed-by: Minchan Kim <minchan.kim@gmail.com> Reviewed-by: Wu Fengguang <fengguang.wu@intel.com> Signed-off-by: Andi Kleen <ak@linux.intel.com>
Diffstat (limited to 'mm')
-rw-r--r--mm/rmap.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/mm/rmap.c b/mm/rmap.c
index 08c112a776a7..7e72ca19d68b 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -820,7 +820,14 @@ static int try_to_unmap_one(struct page *page, struct vm_area_struct *vma,
/* Update high watermark before we lower rss */
update_hiwater_rss(mm);
- if (PageAnon(page)) {
+ if (PageHWPoison(page) && !(flags & TTU_IGNORE_HWPOISON)) {
+ if (PageAnon(page))
+ dec_mm_counter(mm, anon_rss);
+ else
+ dec_mm_counter(mm, file_rss);
+ set_pte_at(mm, address, pte,
+ swp_entry_to_pte(make_hwpoison_entry(page)));
+ } else if (PageAnon(page)) {
swp_entry_t entry = { .val = page_private(page) };
if (PageSwapCache(page)) {