[akpm-mm:mm-unstable 52/72] mm/kasan/common.c:601:14: error: use of undeclared identifier 'KASAN_VMALLOC_KEEP_TAG'

[akpm-mm:mm-unstable 52/72] mm/kasan/common.c:601:14: error: use of undeclared identifier 'KASAN_VMALLOC_KEEP_TAG'

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-unstable
head:   ecc46e02e0abe025a6e840cba2d647f23fd1d721
commit: 6b83afdcfa935db4f836906ca7f0fcafdca8d229 [52/72] kasan: unpoison vms[area] addresses with a common tag
config: arm64-allnoconfig-bpf (https://download.01.org/0day-ci/archive/20251207/202512070851.mejaH1Ql-lkp@intel.com/config)
compiler: clang version 22.0.0git (https://github.com/llvm/llvm-project 2222cfe7e11ff3e0434bc696856629199ef0da7c)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251207/202512070851.mejaH1Ql-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/202512070851.mejaH1Ql-lkp@intel.com/

All errors (new ones prefixed by >>):

>> 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);
         |                                                                      ^~~~~~~~~~~~~~~~~~~~~~
   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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