[merged mm-nonmm-stable] objpool-fix-the-overestimation-of-object-pooling-metadata-size.patch removed from -mm tree

[merged mm-nonmm-stable] objpool-fix-the-overestimation-of-object-pooling-metadata-size.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: objpool: fix the overestimation of object pooling metadata size
has been removed from the -mm tree.  Its filename was
     objpool-fix-the-overestimation-of-object-pooling-metadata-size.patch

This patch was dropped because it was merged into the mm-nonmm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

------------------------------------------------------
From: zhouwenhao <zhouwenhao7600@gmail.com>
Subject: objpool: fix the overestimation of object pooling metadata size
Date: Mon, 2 Feb 2026 21:28:46 +0800

objpool uses struct objpool_head to store metadata information, and its
cpu_slots member points to an array of pointers that store the addresses
of the percpu ring arrays.  However, the memory size allocated during the
initialization of cpu_slots is nr_cpu_ids * sizeof(struct objpool_slot). 
On a 64-bit machine, the size of struct objpool_slot is 16 bytes, which is
twice the size of the actual pointer required, and the extra memory is
never be used, resulting in a waste of memory.  Therefore, the memory size
required for cpu_slots needs to be corrected.

Link: https://lkml.kernel.org/r/20260202132846.68257-1-zhouwenhao7600@gmail.com
Fixes: b4edb8d2d464 ("lib: objpool added: ring-array based lockless MPMC")
Signed-off-by: zhouwenhao <zhouwenhao7600@gmail.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: "Masami Hiramatsu (Google)" <mhiramat@kernel.org>
Cc: Matt Wu <wuqiang.matt@bytedance.com>
Cc: wuqiang.matt <wuqiang.matt@bytedance.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 lib/objpool.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/lib/objpool.c~objpool-fix-the-overestimation-of-object-pooling-metadata-size
+++ a/lib/objpool.c
@@ -142,7 +142,7 @@ int objpool_init(struct objpool_head *po
 	pool->gfp = gfp & ~__GFP_ZERO;
 	pool->context = context;
 	pool->release = release;
-	slot_size = nr_cpu_ids * sizeof(struct objpool_slot);
+	slot_size = nr_cpu_ids * sizeof(struct objpool_slot *);
 	pool->cpu_slots = kzalloc(slot_size, pool->gfp);
 	if (!pool->cpu_slots)
 		return -ENOMEM;
_

Patches currently in -mm which might be from zhouwenhao7600@gmail.com are