Re: [PATCH 24/32] kasan: move kasan_addr_to_slab to common.c

[kernel test robot]

Hi,

I love your patch! Perhaps something to improve:

[auto build test WARNING on akpm-mm/mm-everything]
[also build test WARNING on linus/master v5.19-rc2 next-20220615]
[cannot apply to vbabka-slab/for-next]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/intel-lab-lkp/linux/commits/andrey-konovalov-linux-dev/kasan-switch-tag-based-modes-to-stack-ring-from-per-object-metadata/20220614-042239
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
config: s390-allyesconfig (https://download.01.org/0day-ci/archive/20220615/202206152134.sadCRvGk-lkp@xxxxxxxxx/config)
compiler: s390-linux-gcc (GCC) 11.3.0
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
        # https://github.com/intel-lab-lkp/linux/commit/b0b10a57b2d9a5e5ae5d7ca62046b9774df1a88f
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review andrey-konovalov-linux-dev/kasan-switch-tag-based-modes-to-stack-ring-from-per-object-metadata/20220614-042239
        git checkout b0b10a57b2d9a5e5ae5d7ca62046b9774df1a88f
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.3.0 make.cross W=1 O=build_dir ARCH=s390 SHELL=/bin/bash mm/kasan/

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

All warnings (new ones prefixed by >>):

   mm/kasan/common.c: In function 'kasan_addr_to_slab':
>> mm/kasan/common.c:35:19: warning: ordered comparison of pointer with null pointer [-Wextra]
      35 |         if ((addr >= (void *)PAGE_OFFSET) && (addr < high_memory))
         |                   ^~
   mm/kasan/common.c: In function '____kasan_slab_free':
   mm/kasan/common.c:202:12: warning: variable 'tag' set but not used [-Wunused-but-set-variable]
     202 |         u8 tag;
         |            ^~~


vim +35 mm/kasan/common.c

    32	
    33	struct slab *kasan_addr_to_slab(const void *addr)
    34	{
  > 35		if ((addr >= (void *)PAGE_OFFSET) && (addr < high_memory))
    36			return virt_to_slab(addr);
    37		return NULL;
    38	}
    39	

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