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authorNaoya Horiguchi <n-horiguchi@ah.jp.nec.com>2017-05-03 14:56:19 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2017-05-03 15:52:12 -0700
commit8bcb74de764aaa261d6af3ce5ac723e435f00ff4 (patch)
tree614316758c5c70378ce2fcf40d3c40b2c5d871a9 /mm/memory-failure.c
parentmm/swapfile.c: fix swap space leak in error path of swap_free_entries() (diff)
downloadlinux-dev-8bcb74de764aaa261d6af3ce5ac723e435f00ff4.tar.xz
linux-dev-8bcb74de764aaa261d6af3ce5ac723e435f00ff4.zip
mm: hwpoison: call shake_page() unconditionally
shake_page() is called before going into core error handling code in order to ensure that the error page is flushed from lru_cache lists where pages stay during transferring among LRU lists. But currently it's not fully functional because when the page is linked to lru_cache by calling activate_page(), its PageLRU flag is set and shake_page() is skipped. The result is to fail error handling with "still referenced by 1 users" message. When the page is linked to lru_cache by isolate_lru_page(), its PageLRU is clear, so that's fine. This patch makes shake_page() unconditionally called to avoild the failure. Fixes: 23a003bfd23ea9ea0b7756b920e51f64b284b468 ("mm/madvise: pass return code of memory_failure() to userspace") Link: http://lkml.kernel.org/r/20170417055948.GM31394@yexl-desktop Link: http://lkml.kernel.org/r/1493197841-23986-2-git-send-email-n-horiguchi@ah.jp.nec.com Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Reported-by: kernel test robot <lkp@intel.com> Cc: Xiaolong Ye <xiaolong.ye@intel.com> Cc: Chen Gong <gong.chen@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to '')
-rw-r--r--mm/memory-failure.c27
1 files changed, 11 insertions, 16 deletions
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 92865bb1816d..9d87fcab96c9 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -220,6 +220,9 @@ static int kill_proc(struct task_struct *t, unsigned long addr, int trapno,
*/
void shake_page(struct page *p, int access)
{
+ if (PageHuge(p))
+ return;
+
if (!PageSlab(p)) {
lru_add_drain_all();
if (PageLRU(p))
@@ -1137,22 +1140,14 @@ int memory_failure(unsigned long pfn, int trapno, int flags)
* The check (unnecessarily) ignores LRU pages being isolated and
* walked by the page reclaim code, however that's not a big loss.
*/
- if (!PageHuge(p)) {
- if (!PageLRU(p))
- shake_page(p, 0);
- if (!PageLRU(p)) {
- /*
- * shake_page could have turned it free.
- */
- if (is_free_buddy_page(p)) {
- if (flags & MF_COUNT_INCREASED)
- action_result(pfn, MF_MSG_BUDDY, MF_DELAYED);
- else
- action_result(pfn, MF_MSG_BUDDY_2ND,
- MF_DELAYED);
- return 0;
- }
- }
+ shake_page(p, 0);
+ /* shake_page could have turned it free. */
+ if (!PageLRU(p) && is_free_buddy_page(p)) {
+ if (flags & MF_COUNT_INCREASED)
+ action_result(pfn, MF_MSG_BUDDY, MF_DELAYED);
+ else
+ action_result(pfn, MF_MSG_BUDDY_2ND, MF_DELAYED);
+ return 0;
}
lock_page(hpage);