[kas:lam 9/10] arch/x86/kernel/process.c:1035:37: error: 'mm_context_t' has no member named 'lam'

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/kas/linux.git lam
head:   73447e771c55e18598a6fbf6adee1002aee18ea0
commit: d4e785c333c5cfacdc663cb05ea375238393027e [9/10] x86/mm: Add userspace API to enable Linear Address Masking
config: i386-tinyconfig (https://download.01.org/0day-ci/archive/20220407/202204071441.Xq1KTIgi-lkp@xxxxxxxxx/config)
compiler: gcc-11 (Debian 11.2.0-19) 11.2.0
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/kas/linux.git/commit/?id=d4e785c333c5cfacdc663cb05ea375238393027e
        git remote add kas https://git.kernel.org/pub/scm/linux/kernel/git/kas/linux.git
        git fetch --no-tags kas lam
        git checkout d4e785c333c5cfacdc663cb05ea375238393027e
        # save the config file to linux build tree
        mkdir build_dir
        make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash arch/x86/kernel/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All errors (new ones prefixed by >>):

   arch/x86/kernel/process.c:896:13: warning: no previous prototype for 'arch_post_acpi_subsys_init' [-Wmissing-prototypes]
     896 | void __init arch_post_acpi_subsys_init(void)
         |             ^~~~~~~~~~~~~~~~~~~~~~~~~~
   arch/x86/kernel/process.c: In function 'enable_lam':
>> arch/x86/kernel/process.c:1035:37: error: 'mm_context_t' has no member named 'lam'
    1035 |                 current->mm->context.lam = LAM_U48;
         |                                     ^
   arch/x86/kernel/process.c:1036:38: error: 'mm_context_t' has no member named 'lam'
    1036 |         else if (current->mm->context.lam == LAM_NONE)
         |                                      ^
   arch/x86/kernel/process.c:1037:37: error: 'mm_context_t' has no member named 'lam'
    1037 |                 current->mm->context.lam = LAM_U57;
         |                                     ^


vim +1035 arch/x86/kernel/process.c

  1003	
  1004	static long enable_lam(struct task_struct *task, unsigned long features)
  1005	{
  1006		features |= task->thread.features;
  1007	
  1008		/* LAM_U48 and LAM_U57 are mutually exclusive */
  1009		if ((features & X86_THREAD_LAM_U48) && (features & X86_THREAD_LAM_U57))
  1010			return -EINVAL;
  1011	
  1012		if (in_32bit_syscall())
  1013			return -EINVAL;
  1014	
  1015		if (!cpu_feature_enabled(X86_FEATURE_LAM))
  1016			return -ENXIO;
  1017	
  1018		if (mmap_write_lock_killable(task->mm))
  1019			return -EINTR;
  1020	
  1021		if ((features & X86_THREAD_LAM_U48) && !lam_u48_allowed()) {
  1022			mmap_write_unlock(task->mm);
  1023			return -EINVAL;
  1024		}
  1025	
  1026		/*
  1027		 * Record the most permissive (allowing the widest tags) LAM
  1028		 * mode to the mm context. It determinates if a mappings above
  1029		 * 47 bit is allowed for the process.
  1030		 *
  1031		 * The mode is also used by a kernel thread when it does work
  1032		 * on behalf of the process (like async I/O, io_uring, etc.)
  1033		 */
  1034		if (features & X86_THREAD_LAM_U48)
> 1035			current->mm->context.lam = LAM_U48;
  1036		else if (current->mm->context.lam == LAM_NONE)
  1037			current->mm->context.lam = LAM_U57;
  1038	
  1039		mmap_write_unlock(task->mm);
  1040		return 0;
  1041	}
  1042	

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