+ percpu-fix-wrong-chunk-hints-update.patch added to mm-new branch

+ percpu-fix-wrong-chunk-hints-update.patch added to mm-new branch

[Andrew Morton]

The patch titled
     Subject: percpu: fix wrong chunk hints update
has been added to the -mm mm-new branch.  Its filename is
     percpu-fix-wrong-chunk-hints-update.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/percpu-fix-wrong-chunk-hints-update.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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and is updated there most days

------------------------------------------------------
From: Joonwon Kang <joonwonkang@google.com>
Subject: percpu: fix wrong chunk hints update
Date: Sun, 10 May 2026 07:21:46 +0000

Chunk end offset was set to a block end offset, which could prevent chunk
hints from being updated correctly.  It was observed that the chunk free
size gets minus or shorter than the actual free size due to this.  This
commit fixes it.

Link: https://lore.kernel.org/20260510072149.1279887-1-joonwonkang@google.com
Fixes: 92c14cab4326 ("percpu: convert chunk hints to be based on pcpu_block_md")
Signed-off-by: Joonwon Kang <joonwonkang@google.com>
Reviewed-by: Dennis Zhou <dennis@kernel.org>
Cc: Dennis Zhou <dennis@kernel.org>
Cc: Tejun Heo <tj@kernel.org>
Cc: Christoph Lameter <cl@linux.com>
Cc: <dodam@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/percpu.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/mm/percpu.c~percpu-fix-wrong-chunk-hints-update
+++ a/mm/percpu.c
@@ -1054,7 +1054,7 @@ static void pcpu_block_update_hint_free(
 	else
 		pcpu_block_update(&chunk->chunk_md,
 				  pcpu_block_off_to_off(s_index, start),
-				  end);
+				  pcpu_block_off_to_off(e_index, end));
 }
 
 /**
_

Patches currently in -mm which might be from joonwonkang@google.com are

percpu-fix-wrong-chunk-hints-update.patch
percpu-do-not-trust-hint-starts-when-they-are-not-set.patch
percpu-introduce-struct-pcpu_region.patch
percpu-fix-hint-invariant-breakage.patch