+ mm-memory-failurec-make-non-lru-movable-pages-unhandlable.patch added to -mm tree

[Andrew Morton <akpm@linux-foundation.org>]

The patch titled
     Subject: mm/memory-failure.c: make non-LRU movable pages unhandlable
has been added to the -mm tree.  Its filename is
     mm-memory-failurec-make-non-lru-movable-pages-unhandlable.patch

This patch should soon appear at
    https://ozlabs.org/~akpm/mmots/broken-out/mm-memory-failurec-make-non-lru-movable-pages-unhandlable.patch
and later at
    https://ozlabs.org/~akpm/mmotm/broken-out/mm-memory-failurec-make-non-lru-movable-pages-unhandlable.patch

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------------------------------------------------------
From: Miaohe Lin <linmiaohe@huawei.com>
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@huawei.com
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Suggested-by: Yang Shi <shy828301@gmail.com>
Reviewed-by: Yang Shi <shy828301@gmail.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Naoya Horiguchi <naoya.horiguchi@nec.com>
Cc: Tony Luck <tony.luck@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 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@huawei.com are

mm-memremap-avoid-calling-kasan_remove_zero_shadow-for-device-private-memory.patch
filemap-remove-find_get_pages.patch
mm-writeback-minor-clean-up-for-highmem_dirtyable_memory.patch
mm-shmem-use-helper-macro-__attr_rw.patch
mm-use-helper-function-range_in_vma.patch
mm-use-helper-macro-min-and-max-in-unmap_mapping_range_tree.patch
mm-mmap-remove-obsolete-comment-in-ksys_mmap_pgoff.patch
mm-mremap-use-vma_lookup-instead-of-find_vma.patch
mm-sparse-make-mminit_validate_memmodel_limits-static.patch
mm-vmalloc-remove-unneeded-function-forward-declaration.patch
mm-mmzoneh-remove-unused-macros.patch
mm-memory-failurec-minor-clean-up-for-memory_failure_dev_pagemap.patch
mm-memory-failurec-catch-unexpected-efault-from-vma_address.patch
mm-memory-failurec-rework-the-signaling-logic-in-kill_proc.patch
mm-memory-failurec-fix-race-with-changing-page-more-robustly.patch
mm-memory-failurec-remove-pageslab-check-in-hwpoison_filter_dev.patch
mm-memory-failurec-rework-the-try_to_unmap-logic-in-hwpoison_user_mappings.patch
mm-memory-failurec-remove-obsolete-comment-in-__soft_offline_page.patch
mm-memory-failurec-remove-unnecessary-pagetranstail-check.patch
mm-hwpoison-inject-support-injecting-hwpoison-to-free-page.patch
mm-memory-failurec-fix-race-with-changing-page-compound-again.patch
mm-memory-failurec-avoid-calling-invalidate_inode_page-with-unexpected-pages.patch
mm-memory-failurec-make-non-lru-movable-pages-unhandlable.patch
mm-mlock-fix-potential-imbalanced-rlimit-ucounts-adjustment.patch
mm-hugetlb-use-helper-macro-__attr_rw.patch
mm-remove-unneeded-local-variable-follflags-v2.patch
mm-mempolicy-fix-potential-mpol_new-leak-in-shared_policy_replace.patch
mm-oom_kill-remove-unneeded-is_memcg_oom-check.patch
mm-ksm-use-helper-macro-__attr_rw.patch
mm-madvise-use-vma_lookup-instead-of-find_vma.patch
mm-memory_hotplug-remove-obsolete-comment-of-__add_pages.patch
mm-memory_hotplug-avoid-calling-zone_intersects-for-zone_normal.patch
mm-memory_hotplug-clean-up-try_offline_node.patch
mm-memory_hotplug-fix-misplaced-comment-in-offline_pages.patch
mm-highmem-remove-unnecessary-done-label.patch
mm-hmmc-remove-unneeded-local-variable-ret.patch
kernel-ksysfsc-use-helper-macro-__attr_rw.patch
kernel-resource-fix-kfree-of-bootmem-memory-again.patch
mm-huge_memory-make-is_transparent_hugepage-static.patch