[120/227] mm/hwpoison-inject: support injecting hwpoison to free page

Commit Message

Andrew Morton March 22, 2022, 9:44 p.m. UTC

From: Miaohe Lin <[e-mail]>
Subject: mm/hwpoison-inject: support injecting hwpoison to free page

memory_failure() can handle free buddy page.  Support injecting hwpoison
to free page by adding is_free_buddy_page check when hwpoison filter is
disabled.

[[e-mail]: export is_free_buddy_page() to modules]
Link: https://lkml.kernel.org/r/[e-mail]
Signed-off-by: Miaohe Lin <[e-mail]>
Cc: Naoya Horiguchi <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
---

 mm/hwpoison-inject.c |    4 ++--
 mm/page_alloc.c      |    1 +
 2 files changed, 3 insertions(+), 2 deletions(-)

Patch

--- a/mm/hwpoison-inject.c~mm-hwpoison-inject-support-injecting-hwpoison-to-free-page
+++ a/mm/hwpoison-inject.c
@@ -32,9 +32,9 @@  static int hwpoison_inject(void *data, u
 
 	shake_page(hpage);
 	/*
-	 * This implies unable to support non-LRU pages.
+	 * This implies unable to support non-LRU pages except free page.
 	 */
-	if (!PageLRU(hpage) && !PageHuge(p))
+	if (!PageLRU(hpage) && !PageHuge(p) && !is_free_buddy_page(p))
 		return 0;
 
 	/*
--- a/mm/page_alloc.c~mm-hwpoison-inject-support-injecting-hwpoison-to-free-page
+++ a/mm/page_alloc.c
@@ -9417,6 +9417,7 @@  bool is_free_buddy_page(struct page *pag
 
 	return order < MAX_ORDER;
 }
+EXPORT_SYMBOL(is_free_buddy_page);
 
 #ifdef CONFIG_MEMORY_FAILURE
 /*