[PATCH v2 2/5] crash_dump: save the dm crypt key temporarily

[kernel test robot]

Hi Coiby,

kernel test robot noticed the following build warnings:

[auto build test WARNING on tip/x86/core]
[also build test WARNING on v6.7]
[cannot apply to linus/master next-20240112]
[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/Coiby-Xu/kexec_file-allow-to-place-kexec_buf-randomly/20240110-151859
base:   tip/x86/core
patch link:    https://lore.kernel.org/r/20240110071522.1308935-3-coxu%40redhat.com
patch subject: [PATCH v2 2/5] crash_dump: save the dm crypt key temporarily
config: x86_64-randconfig-123-20240114 (https://download.01.org/0day-ci/archive/20240114/202401140506.JQu60mgM-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240114/202401140506.JQu60mgM-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp at intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202401140506.JQu60mgM-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> kernel/crash_dump_dm_crypt.c:8:6: sparse: sparse: symbol 'wipe_dm_crypt_key' was not declared. Should it be static?
   kernel/crash_dump_dm_crypt.c: note: in included file (through include/linux/mmzone.h, include/linux/gfp.h, include/linux/mm.h, ...):
   include/linux/page-flags.h:242:46: sparse: sparse: self-comparison always evaluates to false

vim +/wipe_dm_crypt_key +8 kernel/crash_dump_dm_crypt.c

     7	
   > 8	void wipe_dm_crypt_key(void)
     9	{
    10		if (dm_crypt_key) {
    11			memset(dm_crypt_key, 0, dm_crypt_key_size * sizeof(u8));
    12			kfree(dm_crypt_key);
    13			dm_crypt_key = NULL;
    14		}
    15	}
    16	

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