| From | Andi Kleen <> | Subject | [PATCH] [11/16] POISON: Handle poisoned pages in try_to_unmap | Date | Tue, 7 Apr 2009 17:10:08 +0200 (CEST) |
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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.
Cc: Lee.Schermerhorn@hp.com Signed-off-by: Andi Kleen <ak@linux.intel.com>
--- mm/rmap.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-)
Index: linux/mm/rmap.c =================================================================== --- linux.orig/mm/rmap.c 2009-04-07 16:39:39.000000000 +0200 +++ linux/mm/rmap.c 2009-04-07 16:39:39.000000000 +0200 @@ -801,7 +801,14 @@ /* Update high watermark before we lower rss */ update_hiwater_rss(mm); - if (PageAnon(page)) { + if (PagePoison(page)) { + if (PageAnon(page)) + dec_mm_counter(mm, anon_rss); + else if (!is_migration_entry(pte_to_swp_entry(*pte))) + dec_mm_counter(mm, file_rss); + set_pte_at(mm, address, pte, + swp_entry_to_pte(make_poison_entry(page))); + } else if (PageAnon(page)) { swp_entry_t entry = { .val = page_private(page) }; if (PageSwapCache(page)) {
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