+ mm-zsmalloc-drop-pool-lock-from-zs_free-on-64-bit-systems-fix-fix.patch added to mm-unstable branch

+ mm-zsmalloc-drop-pool-lock-from-zs_free-on-64-bit-systems-fix-fix.patch added to mm-unstable branch

[Andrew Morton]

The patch titled
     Subject: mm-zsmalloc-drop-pool-lock-from-zs_free-on-64-bit-systems-fix-fix
has been added to the -mm mm-unstable branch.  Its filename is
     mm-zsmalloc-drop-pool-lock-from-zs_free-on-64-bit-systems-fix-fix.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-zsmalloc-drop-pool-lock-from-zs_free-on-64-bit-systems-fix-fix.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: Andrew Morton <akpm@linux-foundation.org>
Subject: mm-zsmalloc-drop-pool-lock-from-zs_free-on-64-bit-systems-fix-fix
Date: Wed Jul  1 03:52:15 PM PDT 2026

fix obj_to_class_idx() warning yet again

Reported-by: kernel test robot <lkp@intel.com>
Link: https://lore.kernel.org/202607020359.FMDmPwjF-lkp@intel.com
Cc: Barry Song <baohua@kernel.org>
Cc: Joshua Hahn <joshua.hahnjy@gmail.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Nhat Pham <nphamcs@gmail.com>
Cc: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Wenchao Hao <haowenchao@xiaomi.com>
Cc: Xueyuan Chen <xueyuan.chen21@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/zsmalloc.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/mm/zsmalloc.c~mm-zsmalloc-drop-pool-lock-from-zs_free-on-64-bit-systems-fix-fix
+++ a/mm/zsmalloc.c
@@ -1457,11 +1457,13 @@ static void obj_free(int class_size, uns
 	mod_zspage_inuse(zspage, -1);
 }
 
+#if (ZS_OBJ_CLASS_BITS > 0) || defined(CONFIG_COMPACTION)
 /* Folds to 0 when ZS_OBJ_CLASS_BITS == 0; no ifdef needed at callers. */
 static unsigned int obj_to_class_idx(unsigned long obj)
 {
 	return (obj >> ZS_OBJ_IDX_BITS) & ZS_OBJ_CLASS_MASK;
 }
+#endif
 
 /*
  * Resolve @handle to its zspage / size_class and acquire class->lock.
_

Patches currently in -mm which might be from akpm@linux-foundation.org are

mm-page_vma_mapped-fix-device-private-pmd-handling-fix.patch
mm-mincore-use-walk_page_range_vma-in-do_mincore-fix.patch
csky-implement-flush_cache_vmap-in-c.patch
mm-vmalloc-map-contiguous-pages-in-batches-for-vmap-if-possible-fix.patch
mm-page_owner-add-print_mode-filter-fix.patch
mm-annotate-data-race-in-cpu_needs_drain-fix.patch
mm-zsmalloc-encode-class-index-in-obj-value-for-lockless-class-lookup-fix.patch
mm-zsmalloc-drop-pool-lock-from-zs_free-on-64-bit-systems-fix.patch
mm-zsmalloc-drop-pool-lock-from-zs_free-on-64-bit-systems-fix-fix.patch
mm-fix-assert_exclusive_bits-by-passing-memdesc_flags_t-by-pointer-fix.patch
drivers-media-v4l2-core-v4l2-vp9c-reduce-inlining.patch