[ammarfaizi2-block:arm64/linux/devel/kmalloc-minalign 8/11] mm/slab_common.c:841:21: warning: no previous prototype for 'arch_kmalloc_minalign'

[kernel test robot]

tree:   https://github.com/ammarfaizi2/linux-block arm64/linux/devel/kmalloc-minalign
head:   2810d5be00a60d5996cd955c2485c17ef1e1e7af
commit: 422900daeb39a7d134f9ea3b8f04575dbf00b68a [8/11] mm/slab: Allow dynamic kmalloc() minimum alignment
config: um-i386_defconfig (https://download.01.org/0day-ci/archive/20220330/202203302227.FiPHL6gt-lkp@xxxxxxxxx/config)
compiler: gcc-9 (Ubuntu 9.4.0-1ubuntu1~20.04.1) 9.4.0
reproduce (this is a W=1 build):
        # https://github.com/ammarfaizi2/linux-block/commit/422900daeb39a7d134f9ea3b8f04575dbf00b68a
        git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block
        git fetch --no-tags ammarfaizi2-block arm64/linux/devel/kmalloc-minalign
        git checkout 422900daeb39a7d134f9ea3b8f04575dbf00b68a
        # save the config file to linux build tree
        mkdir build_dir
        make W=1 O=build_dir ARCH=um SUBARCH=i386 SHELL=/bin/bash

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All warnings (new ones prefixed by >>):

>> mm/slab_common.c:841:21: warning: no previous prototype for 'arch_kmalloc_minalign' [-Wmissing-prototypes]
     841 | unsigned int __weak arch_kmalloc_minalign(void)
         |                     ^~~~~~~~~~~~~~~~~~~~~


vim +/arch_kmalloc_minalign +841 mm/slab_common.c

   840	
 > 841	unsigned int __weak arch_kmalloc_minalign(void)
   842	{
   843		return ARCH_KMALLOC_MINALIGN;
   844	}
   845	

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