Re: [PATCH 1/9] mm: kmemleak: properly disable task stack scanning

[kernel test robot <lkp@intel.com>]

Hi George,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on vbabka-slab/for-next]
[also build test WARNING on linus/master v6.2-rc6]
[cannot apply to akpm-mm/mm-everything]
[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#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/George-Prekas/mm-kmemleak-properly-disable-task-stack-scanning/20230124-010911
base:   git://git.kernel.org/pub/scm/linux/kernel/git/vbabka/slab.git for-next
patch link:    https://lore.kernel.org/r/20230123170419.7292-2-george%40enfabrica.net
patch subject: [PATCH 1/9] mm: kmemleak: properly disable task stack scanning
config: s390-randconfig-s051-20230129 (https://download.01.org/0day-ci/archive/20230201/202302012338.O1vnQ1Ar-lkp@intel.com/config)
compiler: s390-linux-gcc (GCC) 12.1.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # apt-get install sparse
        # sparse version: v0.6.4-39-gce1a6720-dirty
        # https://github.com/intel-lab-lkp/linux/commit/f0d9df4305849ecea4402bc614cadb0dd357da77
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review George-Prekas/mm-kmemleak-properly-disable-task-stack-scanning/20230124-010911
        git checkout f0d9df4305849ecea4402bc614cadb0dd357da77
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=s390 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=s390 SHELL=/bin/bash

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

sparse warnings: (new ones prefixed by >>)
>> mm/kmemleak.c:1244:46: sparse: sparse: incorrect type in argument 1 (different base types) @@     expected unsigned long ptr @@     got void const *ptr @@
   mm/kmemleak.c:1244:46: sparse:     expected unsigned long ptr
   mm/kmemleak.c:1244:46: sparse:     got void const *ptr
   mm/kmemleak.c:1772:13: sparse: sparse: context imbalance in 'kmemleak_seq_start' - different lock contexts for basic block
   mm/kmemleak.c: note: in included file (through include/linux/rculist.h, include/linux/sched/signal.h):
   include/linux/rcupdate.h:795:9: sparse: sparse: context imbalance in 'kmemleak_seq_stop' - unexpected unlock

vim +1244 mm/kmemleak.c

  1233	
  1234	/**
  1235	 * kmemleak_mark_stack - mark the allocated object as a kernel stack
  1236	 *
  1237	 * @ptr:	pointer to beginning of the object
  1238	 */
  1239	void __ref kmemleak_mark_stack(const void *ptr)
  1240	{
  1241		struct kmemleak_object *object;
  1242	
  1243		if (kmemleak_enabled && ptr && !IS_ERR(ptr)) {
> 1244			object = find_and_get_object(ptr, 0);
  1245			if (object) {
  1246				object->flags |= OBJECT_STACK;
  1247				put_object(object);
  1248			}
  1249		}
  1250	}
  1251	

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