The patch titled
Subject: mm/sparse: guard the size of mem_section is power of 2
has been added to the -mm mm-unstable branch. Its filename is
mm-sparse-guard-the-size-of-mem_section-is-power-of-2.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-sparse-guard-the-size-of-mem_section-is-power-of-2.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next via the mm-everything
branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there every 2-3 working days
------------------------------------------------------
From: Wei Yang <richard.weiyang@xxxxxxxxx>
Subject: mm/sparse: guard the size of mem_section is power of 2
Date: Tue, 16 Apr 2024 01:25:59 +0000
We usually have this check, while commit 2a3cb8baef71 ("mm/sparse: delete
old sparse_init and enable new one") missed to take it.
Link: https://lkml.kernel.org/r/20240416012559.4536-1-richard.weiyang@xxxxxxxxx
Signed-off-by: Wei Yang <richard.weiyang@xxxxxxxxx>
Acked-by: Oscar Salvador <osalvador@xxxxxxx>
Reviewed-by: Pasha Tatashin <pasha.tatashin@xxxxxxxxxx>
Cc: "Mike Rapoport (IBM)" <rppt@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/sparse.c | 2 ++
1 file changed, 2 insertions(+)
--- a/mm/sparse.c~mm-sparse-guard-the-size-of-mem_section-is-power-of-2
+++ a/mm/sparse.c
@@ -560,6 +560,8 @@ void __init sparse_init(void)
unsigned long pnum_end, pnum_begin, map_count = 1;
int nid_begin;
+ /* see include/linux/mmzone.h 'struct mem_section' definition */
+ BUILD_BUG_ON(!is_power_of_2(sizeof(struct mem_section)));
memblocks_present();
pnum_begin = first_present_section_nr();
_
Patches currently in -mm which might be from richard.weiyang@xxxxxxxxx are
mm-sparse-guard-the-size-of-mem_section-is-power-of-2.patch
