Re: [PATCH] x86/mm: Introduce 'no5vl kernel parameter

[kbuild test robot]

Hi Kirill,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on tip/auto-latest]
[also build test WARNING on v4.17-rc3 next-20180502]
[cannot apply to tip/x86/core]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Kirill-A-Shutemov/x86-mm-Introduce-no5vl-kernel-parameter/20180503-030855
config: i386-randconfig-x019-201817 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-16) 7.3.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All warnings (new ones prefixed by >>):

   In file included from include/linux/kernel.h:10:0,
                    from include/linux/list.h:9,
                    from include/linux/preempt.h:11,
                    from include/linux/spinlock.h:51,
                    from include/linux/mmzone.h:8,
                    from include/linux/bootmem.h:8,
                    from arch/x86/kernel/cpu/common.c:1:
   arch/x86/kernel/cpu/common.c: In function 'early_identify_cpu':
   arch/x86/kernel/cpu/common.c:1009:7: error: '__pgtable_l5_enabled' undeclared (first use in this function); did you mean 'pgtable_l5_enabled'?
     if (!__pgtable_l5_enabled)
          ^
   include/linux/compiler.h:58:30: note: in definition of macro '__trace_if'
     if (__builtin_constant_p(!!(cond)) ? !!(cond) :   \
                                 ^~~~
>> arch/x86/kernel/cpu/common.c:1009:2: note: in expansion of macro 'if'
     if (!__pgtable_l5_enabled)
     ^~
   arch/x86/kernel/cpu/common.c:1009:7: note: each undeclared identifier is reported only once for each function it appears in
     if (!__pgtable_l5_enabled)
          ^
   include/linux/compiler.h:58:30: note: in definition of macro '__trace_if'
     if (__builtin_constant_p(!!(cond)) ? !!(cond) :   \
                                 ^~~~
>> arch/x86/kernel/cpu/common.c:1009:2: note: in expansion of macro 'if'
     if (!__pgtable_l5_enabled)
     ^~

vim +/if +1009 arch/x86/kernel/cpu/common.c

  1007	
  1008		/* Clear the 5-level paging feature if user asked for 'no5lvl' */
> 1009		if (!__pgtable_l5_enabled)
  1010			setup_clear_cpu_cap(X86_FEATURE_LA57);
  1011	}
  1012	

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