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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: 23a003bfd2 ("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>
zero-colors
Naoya Horiguchi 2017-05-03 14:56:19 -07:00 committed by Linus Torvalds
parent 0ccfece6ed
commit 8bcb74de76
2 changed files with 12 additions and 18 deletions
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3
mm/hwpoison-inject.c
View File

@ -34,8 +34,7 @@ static int hwpoison_inject(void *data, u64 val)
if (!hwpoison_filter_enable)
goto inject;
if (!PageLRU(hpage) && !PageHuge(p))
shake_page(hpage, 0);
shake_page(hpage, 0);
/*
* This implies unable to support non-LRU pages.
*/

27
mm/memory-failure.c
View File

@ -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);