The patch titled
Subject: mm: remove a call to compound_head() from is_page_hwpoison()
has been added to the -mm mm-unstable branch. Its filename is
mm-remove-a-call-to-compound_head-from-is_page_hwpoison.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-remove-a-call-to-compound_head-from-is_page_hwpoison.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>
Subject: mm: remove a call to compound_head() from is_page_hwpoison()
Date: Thu, 21 Mar 2024 14:24:44 +0000
We can call it only once instead of twice.
Link: https://lkml.kernel.org/r/20240321142448.1645400-7-willy@xxxxxxxxxxxxx
Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Reviewed-by: David Hildenbrand <david@xxxxxxxxxx>
Reviewed-by: Miaohe Lin <linmiaohe@xxxxxxxxxx>
Cc: Muchun Song <muchun.song@xxxxxxxxx>
Cc: Oscar Salvador <osalvador@xxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/page-flags.h | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
--- a/include/linux/page-flags.h~mm-remove-a-call-to-compound_head-from-is_page_hwpoison
+++ a/include/linux/page-flags.h
@@ -1065,11 +1065,14 @@ static inline bool PageHuge(const struct
* best effort only and inherently racy: there is no way to synchronize with
* failing hardware.
*/
-static inline bool is_page_hwpoison(struct page *page)
+static inline bool is_page_hwpoison(const struct page *page)
{
+ const struct folio *folio;
+
if (PageHWPoison(page))
return true;
- return PageHuge(page) && PageHWPoison(compound_head(page));
+ folio = page_folio(page);
+ return folio_test_hugetlb(folio) && PageHWPoison(&folio->page);
}
extern bool is_free_buddy_page(struct page *page);
_
Patches currently in -mm which might be from willy@xxxxxxxxxxxxx are
mm-increase-folio-batch-size.patch
mm-always-initialise-folio-_deferred_list.patch
mm-create-folio_flag_false-and-folio_type_ops-macros.patch
mm-remove-folio_prep_large_rmappable.patch
mm-support-page_mapcount-on-page_has_type-pages.patch
mm-turn-folio_test_hugetlb-into-a-pagetype.patch
mm-remove-a-call-to-compound_head-from-is_page_hwpoison.patch
mm-free-up-pg_slab.patch
mm-improve-dumping-of-mapcount-and-page_type.patch
hugetlb-remove-mention-of-destructors.patch
