The patch titled
Subject: mm/sparse: nr_pages won't be 0
has been added to the -mm mm-unstable branch. Its filename is
mm-sparse-nr_pages-wont-be-0.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-sparse-nr_pages-wont-be-0.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: Wei Yang <richard.weiyang@xxxxxxxxx>
Subject: mm/sparse: nr_pages won't be 0
Date: Wed, 19 Jun 2024 01:06:09 +0000
Function subsection_map_init() is only used in free_area_init() in the
loop of for_each_mem_pfn_range(). And we are sure in each iteration of
for_each_mem_pfn_range(), start_pfn < end_pfn.
So nr_pages is not possible to be 0 and we can remove the check.
Link: https://lkml.kernel.org/r/20240619010612.20740-1-richard.weiyang@xxxxxxxxx
Signed-off-by: Wei Yang <richard.weiyang@xxxxxxxxx>
Cc: Mike Rapoport (IBM) <rppt@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/sparse.c | 3 ---
1 file changed, 3 deletions(-)
--- a/mm/sparse.c~mm-sparse-nr_pages-wont-be-0
+++ a/mm/sparse.c
@@ -195,9 +195,6 @@ void __init subsection_map_init(unsigned
int end_sec_nr = pfn_to_section_nr(pfn + nr_pages - 1);
unsigned long nr, start_sec_nr = pfn_to_section_nr(pfn);
- if (!nr_pages)
- return;
-
for (nr = start_sec_nr; nr <= end_sec_nr; nr++) {
struct mem_section *ms;
unsigned long pfns;
_
Patches currently in -mm which might be from richard.weiyang@xxxxxxxxx are
mm-mm_initc-print-mem_init-info-after-defer_init-is-done.patch
mm-mm_initc-simplify-logic-of-deferred__pages.patch
mm-mm_initc-simplify-logic-of-deferred__pages-v2.patch
mm-sparse-nr_pages-wont-be-0.patch
mm-mm_initc-move-build-check-on-max_zonelists-out-of-ifdef.patch
mm-page_alloc-fix-a-typo-in-comment-about-gfp-flag.patch
mm-page_alloc-reword-the-comment-of-buddy_merge_likely.patch
