On Tue, Aug 27, 2019 at 03:05:50PM +0800, Cao jin wrote:
> They are wrappers of BUILD_BUG_ON_ZERO(NCAPINTS != n), which is already
> present in corresponding *_MASK_BIT_SET. And fill the missing period in
> head comments by the way.
>
> Signed-off-by: Cao jin <caoj.f...@cn.fujitsu.com>
> ---
> arch/x86/include/asm/cpufeature.h | 2 --
> arch/x86/include/asm/disabled-features.h | 1 -
> arch/x86/include/asm/required-features.h | 3 +--
> 3 files changed, 1 insertion(+), 5 deletions(-)
>
> diff --git a/arch/x86/include/asm/cpufeature.h
> b/arch/x86/include/asm/cpufeature.h
> index 58acda503817..232ffb88039c 100644
> --- a/arch/x86/include/asm/cpufeature.h
> +++ b/arch/x86/include/asm/cpufeature.h
> @@ -81,7 +81,6 @@ extern const char * const x86_bug_flags[NBUGINTS*32];
> CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 16, feature_bit) || \
> CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 17, feature_bit) || \
> CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 18, feature_bit) || \
> - REQUIRED_MASK_CHECK || \
> BUILD_BUG_ON_ZERO(NCAPINTS != 19))
>
> #define DISABLED_MASK_BIT_SET(feature_bit) \
> @@ -104,7 +103,6 @@ extern const char * const x86_bug_flags[NBUGINTS*32];
> CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 16, feature_bit) || \
> CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 17, feature_bit) || \
> CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 18, feature_bit) || \
> - DISABLED_MASK_CHECK || \
> BUILD_BUG_ON_ZERO(NCAPINTS != 19))
>
> #define cpu_has(c, bit)
> \
If you do a little bit of git archeology:
$ git annotate arch/x86/include/asm/cpufeature.h
after a while, you'll see that this was added in:
1e61f78baf89 ("x86/cpufeature: Make sure DISABLED/REQUIRED macros are updated")
and then you could Cc Dave and ask what he was thinking then?
Leaving in the rest for reference.
> diff --git a/arch/x86/include/asm/disabled-features.h
> b/arch/x86/include/asm/disabled-features.h
> index a5ea841cc6d2..8a2eafa86739 100644
> --- a/arch/x86/include/asm/disabled-features.h
> +++ b/arch/x86/include/asm/disabled-features.h
> @@ -84,6 +84,5 @@
> #define DISABLED_MASK16
> (DISABLE_PKU|DISABLE_OSPKE|DISABLE_LA57|DISABLE_UMIP)
> #define DISABLED_MASK17 0
> #define DISABLED_MASK18 0
> -#define DISABLED_MASK_CHECK BUILD_BUG_ON_ZERO(NCAPINTS != 19)
>
> #endif /* _ASM_X86_DISABLED_FEATURES_H */
> diff --git a/arch/x86/include/asm/required-features.h
> b/arch/x86/include/asm/required-features.h
> index 6847d85400a8..cb98b66d3e81 100644
> --- a/arch/x86/include/asm/required-features.h
> +++ b/arch/x86/include/asm/required-features.h
> @@ -1,7 +1,7 @@
> #ifndef _ASM_X86_REQUIRED_FEATURES_H
> #define _ASM_X86_REQUIRED_FEATURES_H
>
> -/* Define minimum CPUID feature set for kernel These bits are checked
> +/* Define minimum CPUID feature set for kernel. These bits are checked
> really early to actually display a visible error message before the
> kernel dies. Make sure to assign features to the proper mask!
>
> @@ -101,6 +101,5 @@
> #define REQUIRED_MASK16 0
> #define REQUIRED_MASK17 0
> #define REQUIRED_MASK18 0
> -#define REQUIRED_MASK_CHECK BUILD_BUG_ON_ZERO(NCAPINTS != 19)
>
> #endif /* _ASM_X86_REQUIRED_FEATURES_H */
> --
> 2.17.0
--
Regards/Gruss,
Boris.
Good mailing practices for 400: avoid top-posting and trim the reply.
