[linux-next:master 13538/13721] mm/kasan/common.c:601:14: error: use of undeclared identifier 'KASAN_VMALLOC_KEEP_TAG'

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   82bcd04d124a4d84580ea4a8ba6b120db5f512e7
commit: 6b83afdcfa935db4f836906ca7f0fcafdca8d229 [13538/13721] kasan: unpoison vms[area] addresses with a common tag
config: um-allmodconfig (https://download.01.org/0day-ci/archive/20251208/202512081926.ICUawXRm-lkp@intel.com/config)
compiler: clang version 19.1.7 (https://github.com/llvm/llvm-project cd708029e0b2869e80abe31ddb175f7c35361f90)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251208/202512081926.ICUawXRm-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/202512081926.ICUawXRm-lkp@intel.com/

Note: the linux-next/master HEAD 82bcd04d124a4d84580ea4a8ba6b120db5f512e7 builds fine.
      It may have been fixed somewhere.

All errors (new ones prefixed by >>):

   In file included from mm/kasan/common.c:17:
   In file included from include/linux/memblock.h:13:
   In file included from arch/um/include/asm/dma.h:5:
   In file included from arch/um/include/asm/io.h:24:
   include/asm-generic/io.h:1209:55: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
    1209 |         return (port > MMIO_UPPER_LIMIT) ? NULL : PCI_IOBASE + port;
         |                                                   ~~~~~~~~~~ ^
>> mm/kasan/common.c:601:14: error: use of undeclared identifier 'KASAN_VMALLOC_KEEP_TAG'
     601 |         if (flags & KASAN_VMALLOC_KEEP_TAG) {
         |                     ^
   mm/kasan/common.c:615:49: error: use of undeclared identifier 'KASAN_VMALLOC_KEEP_TAG'
     615 |                         __kasan_unpoison_vmalloc(addr, size, flags | KASAN_VMALLOC_KEEP_TAG);
         |                                                                      ^
   1 warning and 2 errors generated.


vim +/KASAN_VMALLOC_KEEP_TAG +601 mm/kasan/common.c

   586	
   587	#ifdef CONFIG_KASAN_VMALLOC
   588	void __kasan_unpoison_vmap_areas(struct vm_struct **vms, int nr_vms,
   589					 kasan_vmalloc_flags_t flags)
   590	{
   591		unsigned long size;
   592		void *addr;
   593		int area;
   594		u8 tag;
   595	
   596		/*
   597		 * If KASAN_VMALLOC_KEEP_TAG was set at this point, all vms[] pointers
   598		 * would be unpoisoned with the KASAN_TAG_KERNEL which would disable
   599		 * KASAN checks down the line.
   600		 */
 > 601		if (flags & KASAN_VMALLOC_KEEP_TAG) {

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