linux-kernel - [ammarfaizi2-block:arm64/linux/devel/kmalloc-minalign-v2-wip 8/10] mm/slab_common.c:659:27: warning: no previous prototype for function 'create_kmalloc

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Message-ID: <202210011652.rt7xNd6T-lkp@intel.com>
Date:   Sat, 1 Oct 2022 16:23:25 +0800
From:   kernel test robot <lkp@...el.com>
To:     Catalin Marinas <catalin.marinas@....com>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        Ammar Faizi <ammarfaizi2@...weeb.org>,
        GNU/Weeb Mailing List <gwml@...r.gnuweeb.org>,
        linux-kernel@...r.kernel.org
Subject: [ammarfaizi2-block:arm64/linux/devel/kmalloc-minalign-v2-wip 8/10]
 mm/slab_common.c:659:27: warning: no previous prototype for function
 'create_kmalloc_cache'

Hi Catalin,

FYI, the error/warning was bisected to this commit, please ignore it if it's irrelevant.

tree:   https://github.com/ammarfaizi2/linux-block arm64/linux/devel/kmalloc-minalign-v2-wip
head:   168a8e28785ff49842163cb8cd2aebd5ed90e6a4
commit: 8ddce10ef74e9c1aaeed401f89f4a17b36a55c5c [8/10] mm: slab: Use new_kmalloc_cache() for initialising the INDEX_NODE
config: powerpc-icon_defconfig
compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project 791a7ae1ba3efd6bca96338e10ffde557ba83920)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install powerpc cross compiling tool for clang build
        # apt-get install binutils-powerpc-linux-gnu
        # https://github.com/ammarfaizi2/linux-block/commit/8ddce10ef74e9c1aaeed401f89f4a17b36a55c5c
        git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block
        git fetch --no-tags ammarfaizi2-block arm64/linux/devel/kmalloc-minalign-v2-wip
        git checkout 8ddce10ef74e9c1aaeed401f89f4a17b36a55c5c
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=powerpc SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@...el.com>

All warnings (new ones prefixed by >>):

>> mm/slab_common.c:659:27: warning: no previous prototype for function 'create_kmalloc_cache' [-Wmissing-prototypes]
   struct kmem_cache *__init create_kmalloc_cache(const char *name,
                             ^
   mm/slab_common.c:659:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   struct kmem_cache *__init create_kmalloc_cache(const char *name,
   ^
   static 
   1 warning generated.


vim +/create_kmalloc_cache +659 mm/slab_common.c

45530c4474d258 Christoph Lameter 2012-11-28  658  
55de8b9c60f2f6 Alexey Dobriyan   2018-04-05 @659  struct kmem_cache *__init create_kmalloc_cache(const char *name,
55de8b9c60f2f6 Alexey Dobriyan   2018-04-05  660  		unsigned int size, slab_flags_t flags,
55de8b9c60f2f6 Alexey Dobriyan   2018-04-05  661  		unsigned int useroffset, unsigned int usersize)
45530c4474d258 Christoph Lameter 2012-11-28  662  {
45530c4474d258 Christoph Lameter 2012-11-28  663  	struct kmem_cache *s = kmem_cache_zalloc(kmem_cache, GFP_NOWAIT);
45530c4474d258 Christoph Lameter 2012-11-28  664  
45530c4474d258 Christoph Lameter 2012-11-28  665  	if (!s)
45530c4474d258 Christoph Lameter 2012-11-28  666  		panic("Out of memory when creating slab %s\n", name);
45530c4474d258 Christoph Lameter 2012-11-28  667  
6c0c21adc742a2 David Windsor     2017-06-10  668  	create_boot_cache(s, name, size, flags, useroffset, usersize);
928501344fc645 Andrey Konovalov  2021-02-25  669  	kasan_cache_create_kmalloc(s);
45530c4474d258 Christoph Lameter 2012-11-28  670  	list_add(&s->list, &slab_caches);
45530c4474d258 Christoph Lameter 2012-11-28  671  	s->refcount = 1;
45530c4474d258 Christoph Lameter 2012-11-28  672  	return s;
45530c4474d258 Christoph Lameter 2012-11-28  673  }
45530c4474d258 Christoph Lameter 2012-11-28  674  

:::::: The code at line 659 was first introduced by commit
:::::: 55de8b9c60f2f6da9bf5c9144020882d07e62296 slab: make create_kmalloc_cache() work with 32-bit sizes

:::::: TO: Alexey Dobriyan <adobriyan@...il.com>
:::::: CC: Linus Torvalds <torvalds@...ux-foundation.org>

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp

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