arch/x86/include/asm/unwind_user.h:16:12: error: no member named 'flags' in 'struct pt_regs'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git perf/core
head:   c69993ecdd4dfde2b7da08b022052a33b203da07
commit: 49cf34c0815f93fb2ea3ab5cfbac1124bd9b45d0 [18/20] unwind_user/x86: Enable frame pointer unwinding on x86
config: um-allnoconfig (https://download.01.org/0day-ci/archive/20251029/[email protected]/config)
compiler: clang version 22.0.0git (https://github.com/llvm/llvm-project d1c086e82af239b245fe8d7832f2753436634990)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251029/[email protected]/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 <[email protected]>
| Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/

All errors (new ones prefixed by >>):

In file included from kernel/fork.c:108:
In file included from include/linux/unwind_deferred.h:6:
In file included from include/linux/unwind_user.h:6:

>> arch/x86/include/asm/unwind_user.h:16:12: error: no member named 'flags' in 'struct pt_regs'
      16 |         if (regs->flags & X86_VM_MASK)
         |             ~~~~  ^
>> arch/x86/include/asm/unwind_user.h:16:20: error: use of undeclared identifier 'X86_VM_MASK'
      16 |         if (regs->flags & X86_VM_MASK)
         |                           ^~~~~~~~~~~

2 errors generated.

vim +16 arch/x86/include/asm/unwind_user.h

     6	
     7	#define ARCH_INIT_USER_FP_FRAME(ws)			\
     8		.cfa_off	=  2*(ws),			\
     9		.ra_off		= -1*(ws),			\
    10		.fp_off		= -2*(ws),			\
    11		.use_fp		= true,
    12	
    13	static inline int unwind_user_word_size(struct pt_regs *regs)
    14	{
    15		/* We can't unwind VM86 stacks */
  > 16		if (regs->flags & X86_VM_MASK)
    17			return 0;
    18	#ifdef CONFIG_X86_64
    19		if (!user_64bit_mode(regs))
    20			return sizeof(int);
    21	#endif
    22		return sizeof(long);
    23	}
    24	

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