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 errors:

[auto build test ERROR on akpm-mm/mm-everything]
[also build test ERROR 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-001-20250501 (https://download.01.org/0day-ci/archive/20250501/202505010807.0tj4Krnz-lkp@intel.com/config)
compiler: clang version 20.1.2 (https://github.com/llvm/llvm-project 58df0ef89dd64126512e4ee27b4ac3fd8ddf6247)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250501/202505010807.0tj4Krnz-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/202505010807.0tj4Krnz-lkp@intel.com/

All errors (new ones prefixed by >>):

>> mm/kasan/shadow.c:313:11: error: call to undeclared function 'pfn_to_virt'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     313 |         __memset(pfn_to_virt(pfn), KASAN_VMALLOC_INVALID, PAGE_SIZE);
         |                  ^
   mm/kasan/shadow.c:313:11: note: did you mean 'fix_to_virt'?
   include/asm-generic/fixmap.h:30:38: note: 'fix_to_virt' declared here
      30 | static __always_inline unsigned long fix_to_virt(const unsigned int idx)
         |                                      ^
>> mm/kasan/shadow.c:313:11: error: incompatible integer to pointer conversion passing 'int' to parameter of type 'void *' [-Wint-conversion]
     313 |         __memset(pfn_to_virt(pfn), KASAN_VMALLOC_INVALID, PAGE_SIZE);
         |                  ^~~~~~~~~~~~~~~~
   arch/x86/include/asm/string_64.h:23:22: note: passing argument to parameter 's' here
      23 | void *__memset(void *s, int c, size_t n);
         |                      ^
   2 errors generated.


vim +/pfn_to_virt +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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