The patch titled
Subject: mm/memory-failure.c: make non-LRU movable pages unhandlable
has been removed from the -mm tree. Its filename was
mm-memory-failurec-make-non-lru-movable-pages-unhandlable.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: Miaohe Lin <linmiaohe@xxxxxxxxxx>
Subject: mm/memory-failure.c: make non-LRU movable pages unhandlable
We can not really handle non-LRU movable pages in memory failure.
Typically they are balloon, zsmalloc, etc. Assuming we run into a base
(4K) non-LRU movable page, we could reach as far as identify_page_state(),
it should not fall into any category except me_unknown.
For the non-LRU compound movable pages, they could be taken for transhuge
pages but it's unexpected to split non-LRU movable pages using
split_huge_page_to_list in memory_failure. So we could just simply make
non-LRU movable pages unhandlable to avoid these possible nasty cases.
Link: https://lkml.kernel.org/r/20220312074613.4798-4-linmiaohe@xxxxxxxxxx
Signed-off-by: Miaohe Lin <linmiaohe@xxxxxxxxxx>
Suggested-by: Yang Shi <shy828301@xxxxxxxxx>
Reviewed-by: Yang Shi <shy828301@xxxxxxxxx>
Acked-by: Naoya Horiguchi <naoya.horiguchi@xxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
Cc: Tony Luck <tony.luck@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memory-failure.c | 20 +++++++++++++-------
1 file changed, 13 insertions(+), 7 deletions(-)
--- a/mm/memory-failure.c~mm-memory-failurec-make-non-lru-movable-pages-unhandlable
+++ a/mm/memory-failure.c
@@ -1176,12 +1176,18 @@ void ClearPageHWPoisonTakenOff(struct pa
* does not return true for hugetlb or device memory pages, so it's assumed
* to be called only in the context where we never have such pages.
*/
-static inline bool HWPoisonHandlable(struct page *page)
+static inline bool HWPoisonHandlable(struct page *page, unsigned long flags)
{
- return PageLRU(page) || __PageMovable(page) || is_free_buddy_page(page);
+ bool movable = false;
+
+ /* Soft offline could mirgate non-LRU movable pages */
+ if ((flags & MF_SOFT_OFFLINE) && __PageMovable(page))
+ movable = true;
+
+ return movable || PageLRU(page) || is_free_buddy_page(page);
}
-static int __get_hwpoison_page(struct page *page)
+static int __get_hwpoison_page(struct page *page, unsigned long flags)
{
struct page *head = compound_head(page);
int ret = 0;
@@ -1196,7 +1202,7 @@ static int __get_hwpoison_page(struct pa
* for any unsupported type of page in order to reduce the risk of
* unexpected races caused by taking a page refcount.
*/
- if (!HWPoisonHandlable(head))
+ if (!HWPoisonHandlable(head, flags))
return -EBUSY;
if (get_page_unless_zero(head)) {
@@ -1221,7 +1227,7 @@ static int get_any_page(struct page *p,
try_again:
if (!count_increased) {
- ret = __get_hwpoison_page(p);
+ ret = __get_hwpoison_page(p, flags);
if (!ret) {
if (page_count(p)) {
/* We raced with an allocation, retry. */
@@ -1249,7 +1255,7 @@ try_again:
}
}
- if (PageHuge(p) || HWPoisonHandlable(p)) {
+ if (PageHuge(p) || HWPoisonHandlable(p, flags)) {
ret = 1;
} else {
/*
@@ -2302,7 +2308,7 @@ int soft_offline_page(unsigned long pfn,
retry:
get_online_mems();
- ret = get_hwpoison_page(page, flags);
+ ret = get_hwpoison_page(page, flags | MF_SOFT_OFFLINE);
put_online_mems();
if (ret > 0) {
_
Patches currently in -mm which might be from linmiaohe@xxxxxxxxxx are
mm-huge_memory-make-is_transparent_hugepage-static.patch
