The patch titled
Subject: mm/page_alloc: drop the unnecessary pfn_valid() for start pfn
has been added to the -mm mm-unstable branch. Its filename is
mm-page_alloc-drop-the-unnecessary-pfn_valid-for-start-pfn.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-page_alloc-drop-the-unnecessary-pfn_valid-for-start-pfn.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: Baolin Wang <baolin.wang@xxxxxxxxxxxxxxxxx>
Subject: mm/page_alloc: drop the unnecessary pfn_valid() for start pfn
Date: Mon, 24 Apr 2023 21:45:39 +0800
__pageblock_pfn_to_page() currently performs both pfn_valid check and
pfn_to_online_page(). The former one is redundant because the latter is a
stronger check. Drop pfn_valid().
Link: https://lkml.kernel.org/r/c3868b58c6714c09a43440d7d02c7b4eed6e03f6.1682342634.git.baolin.wang@xxxxxxxxxxxxxxxxx
Signed-off-by: Baolin Wang <baolin.wang@xxxxxxxxxxxxxxxxx>
Reviewed-by: David Hildenbrand <david@xxxxxxxxxx>
Reviewed-by: "Huang, Ying" <ying.huang@xxxxxxxxx>
Acked-by: Michal Hocko <mhocko@xxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Cc: Mike Rapoport (IBM) <rppt@xxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page_alloc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/mm/page_alloc.c~mm-page_alloc-drop-the-unnecessary-pfn_valid-for-start-pfn
+++ a/mm/page_alloc.c
@@ -1521,7 +1521,7 @@ struct page *__pageblock_pfn_to_page(uns
/* end_pfn is one past the range we are checking */
end_pfn--;
- if (!pfn_valid(start_pfn) || !pfn_valid(end_pfn))
+ if (!pfn_valid(end_pfn))
return NULL;
start_page = pfn_to_online_page(start_pfn);
_
Patches currently in -mm which might be from baolin.wang@xxxxxxxxxxxxxxxxx are
mm-page_alloc-add-some-comments-to-explain-the-possible-hole-in-__pageblock_pfn_to_page.patch
mm-page_alloc-drop-the-unnecessary-pfn_valid-for-start-pfn.patch
