+ percpu-remove-unnecessary-cpumask_clear-in-pcpu_build_alloc_info.patch added to mm-new branch

+ percpu-remove-unnecessary-cpumask_clear-in-pcpu_build_alloc_info.patch added to mm-new branch

[Andrew Morton]

The patch titled
     Subject: percpu: remove unnecessary cpumask_clear() in pcpu_build_alloc_info()
has been added to the -mm mm-new branch.  Its filename is
     percpu-remove-unnecessary-cpumask_clear-in-pcpu_build_alloc_info.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/percpu-remove-unnecessary-cpumask_clear-in-pcpu_build_alloc_info.patch

This patch will later appear in the mm-new branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Note, mm-new is a provisional staging ground for work-in-progress
patches, and acceptance into mm-new is a notification for others take
notice and to finish up reviews.  Please do not hesitate to respond to
review feedback and post updated versions to replace or incrementally
fixup patches in mm-new.

The mm-new branch of mm.git is not included in linux-next

If a few days of testing in mm-new is successful, the patch will me moved
into mm.git's mm-unstable branch, which is included in linux-next

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------------------------------------------------------
From: Sang-Heon Jeon <ekffu200098@gmail.com>
Subject: percpu: remove unnecessary cpumask_clear() in pcpu_build_alloc_info()
Date: Wed, 2 Sep 2026 01:53:03 +0900

pcpu_build_alloc_info() clears mask and unconditionally sets it to
cpu_possible_mask.  Nothing uses it in between, so cpumask_clear() has no
effect.

Remove unnecessary cpumask_clear().

No functional change.

Link: https://lore.kernel.org/20260901165307.1026248-4-ekffu200098@gmail.com
Signed-off-by: Sang-Heon Jeon <ekffu200098@gmail.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Dennis Zhou <dennis@kernel.org>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/percpu.c |    1 -
 1 file changed, 1 deletion(-)

--- a/mm/percpu.c~percpu-remove-unnecessary-cpumask_clear-in-pcpu_build_alloc_info
+++ a/mm/percpu.c
@@ -2828,7 +2828,6 @@ static struct pcpu_alloc_info * __init _
 	/* this function may be called multiple times */
 	memset(group_map, 0, sizeof(group_map));
 	memset(group_cnt, 0, sizeof(group_cnt));
-	cpumask_clear(&mask);
 
 	/* calculate size_sum and ensure dyn_size is enough for early alloc */
 	size_sum = PFN_ALIGN(static_size + reserved_size +
_

Patches currently in -mm which might be from ekffu200098@gmail.com are

percpu-fix-the-comment-about-which-sizes-share-a-slot.patch
percpu-remove-redundant-assignments-to-bits.patch
percpu-remove-unnecessary-initialization-in-pcpu_build_alloc_info.patch
percpu-remove-unnecessary-cpumask_clear-in-pcpu_build_alloc_info.patch
percpu-remove-unnecessary-return-in-pcpu_populate_pte.patch