Commit 888b9f7c authored by Andi Kleen's avatar Andi Kleen

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: default avatarMinchan Kim <minchan.kim@gmail.com>
Reviewed-by: default avatarWu Fengguang <fengguang.wu@intel.com>
Signed-off-by: default avatarAndi Kleen <ak@linux.intel.com>
parent 14fa31b8
...@@ -93,6 +93,7 @@ enum ttu_flags { ...@@ -93,6 +93,7 @@ enum ttu_flags {
TTU_IGNORE_MLOCK = (1 << 8), /* ignore mlock */ TTU_IGNORE_MLOCK = (1 << 8), /* ignore mlock */
TTU_IGNORE_ACCESS = (1 << 9), /* don't age */ TTU_IGNORE_ACCESS = (1 << 9), /* don't age */
TTU_IGNORE_HWPOISON = (1 << 10),/* corrupted page is recoverable */
}; };
#define TTU_ACTION(x) ((x) & TTU_ACTION_MASK) #define TTU_ACTION(x) ((x) & TTU_ACTION_MASK)
......
...@@ -820,7 +820,14 @@ static int try_to_unmap_one(struct page *page, struct vm_area_struct *vma, ...@@ -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 high watermark before we lower rss */
update_hiwater_rss(mm); 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) }; swp_entry_t entry = { .val = page_private(page) };
if (PageSwapCache(page)) { if (PageSwapCache(page)) {
......
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