[merged mm-hotfixes-stable] mm-zsmalloc-add-__maybe_unused-attribute-for-is_first_zpdesc.patch removed from -mm tree

[merged mm-hotfixes-stable] mm-zsmalloc-add-__maybe_unused-attribute-for-is_first_zpdesc.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: mm/zsmalloc: add __maybe_unused attribute for is_first_zpdesc()
has been removed from the -mm tree.  Its filename was
     mm-zsmalloc-add-__maybe_unused-attribute-for-is_first_zpdesc.patch

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

------------------------------------------------------
From: Hyeonggon Yoo <42.hyeyoo@gmail.com>
Subject: mm/zsmalloc: add __maybe_unused attribute for is_first_zpdesc()
Date: Tue, 28 Jan 2025 08:16:31 +0900

Commit c1b3bb73d55e ("mm/zsmalloc: use zpdesc in
trylock_zspage()/lock_zspage()") introduces is_first_zpdesc() function. 
However, the function is only used when CONFIG_DEBUG_VM=y.

When building with LLVM=1 and W=1 option, the following warning is
generated:
  $ make -j12 W=1 LLVM=1 mm/zsmalloc.o
  mm/zsmalloc.c:455:20: error: function 'is_first_zpdesc' is not needed and will not be emitted [-Werror,-Wunneeded-internal-declaration]
    455 | static inline bool is_first_zpdesc(struct zpdesc *zpdesc)
        |                    ^~~~~~~~~~~~~~~
  1 error generated.

Fix the warning by adding __maybe_unused attribute to the function.
No functional change intended.

Link: https://lkml.kernel.org/r/20250127231631.4363-1-42.hyeyoo@gmail.com
Fixes: c1b3bb73d55e ("mm/zsmalloc: use zpdesc in trylock_zspage()/lock_zspage()")
Signed-off-by: Hyeonggon Yoo <42.hyeyoo@gmail.com>
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202501240958.4ILzuBrH-lkp@intel.com/
Cc: Alex Shi <alexs@kernel.org>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Sergey Senozhatsky <senozhatsky@chromium.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

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

--- a/mm/zsmalloc.c~mm-zsmalloc-add-__maybe_unused-attribute-for-is_first_zpdesc
+++ a/mm/zsmalloc.c
@@ -452,7 +452,7 @@ static DEFINE_PER_CPU(struct mapping_are
 	.lock	= INIT_LOCAL_LOCK(lock),
 };
 
-static inline bool is_first_zpdesc(struct zpdesc *zpdesc)
+static inline bool __maybe_unused is_first_zpdesc(struct zpdesc *zpdesc)
 {
 	return PagePrivate(zpdesc_page(zpdesc));
 }
_

Patches currently in -mm which might be from 42.hyeyoo@gmail.com are

mm-zswap-fix-inconsistency-when-zswap_store_page-fails.patch
mm-zswap-fix-inconsistency-when-zswap_store_page-fails-fix.patch