Re: [PATCH v3 1/1] kasan: Avoid sleepable page allocation from atomic context

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

Hi Alexander,

kernel test robot noticed the following build warnings:

[auto build test WARNING on akpm-mm/mm-everything]
[also build test WARNING on linus/master v6.15-rc4 next-20250430]
[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/Alexander-Gordeev/kasan-Avoid-sleepable-page-allocation-from-atomic-context/20250430-001020
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link:    https://lore.kernel.org/r/573a823565734e1eac3aa128fb9d3506ec918a72.1745940843.git.agordeev%40linux.ibm.com
patch subject: [PATCH v3 1/1] kasan: Avoid sleepable page allocation from atomic context
config: x86_64-buildonly-randconfig-002-20250501 (https://download.01.org/0day-ci/archive/20250501/202505010957.08s1jPkF-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/20250501/202505010957.08s1jPkF-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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202505010957.08s1jPkF-lkp@intel.com/

All warnings (new ones prefixed by >>):

   mm/kasan/shadow.c: In function 'kasan_populate_vmalloc_pte':
   mm/kasan/shadow.c:313:18: error: implicit declaration of function 'pfn_to_virt'; did you mean 'fix_to_virt'? [-Werror=implicit-function-declaration]
     313 |         __memset(pfn_to_virt(pfn), KASAN_VMALLOC_INVALID, PAGE_SIZE);
         |                  ^~~~~~~~~~~
         |                  fix_to_virt
>> mm/kasan/shadow.c:313:18: warning: passing argument 1 of '__memset' makes pointer from integer without a cast [-Wint-conversion]
     313 |         __memset(pfn_to_virt(pfn), KASAN_VMALLOC_INVALID, PAGE_SIZE);
         |                  ^~~~~~~~~~~~~~~~
         |                  |
         |                  int
   In file included from arch/x86/include/asm/string.h:5,
                    from arch/x86/include/asm/cpuid/api.h:10,
                    from arch/x86/include/asm/cpuid.h:6,
                    from arch/x86/include/asm/processor.h:19,
                    from arch/x86/include/asm/cpufeature.h:5,
                    from arch/x86/include/asm/thread_info.h:59,
                    from include/linux/thread_info.h:60,
                    from include/linux/spinlock.h:60,
                    from arch/x86/include/asm/pgtable.h:19,
                    from include/linux/pgtable.h:6,
                    from include/linux/kasan.h:37,
                    from mm/kasan/shadow.c:14:
   arch/x86/include/asm/string_64.h:23:22: note: expected 'void *' but argument is of type 'int'
      23 | void *__memset(void *s, int c, size_t n);
         |                ~~~~~~^
   cc1: some warnings being treated as errors


vim +/__memset +313 mm/kasan/shadow.c

   299	
   300	static int kasan_populate_vmalloc_pte(pte_t *ptep, unsigned long addr,
   301					      void *_data)
   302	{
   303		struct vmalloc_populate_data *data = _data;
   304		struct page *page;
   305		unsigned long pfn;
   306		pte_t pte;
   307	
   308		if (likely(!pte_none(ptep_get(ptep))))
   309			return 0;
   310	
   311		page = data->pages[PFN_DOWN(addr - data->start)];
   312		pfn = page_to_pfn(page);
 > 313		__memset(pfn_to_virt(pfn), KASAN_VMALLOC_INVALID, PAGE_SIZE);
   314		pte = pfn_pte(pfn, PAGE_KERNEL);
   315	
   316		spin_lock(&init_mm.page_table_lock);
   317		if (likely(pte_none(ptep_get(ptep))))
   318			set_pte_at(&init_mm, addr, ptep, pte);
   319		spin_unlock(&init_mm.page_table_lock);
   320	
   321		return 0;
   322	}
   323	

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