From: Dave Hansen <[email protected]> There are a few other features than MPX that we can make assumptions about at compile-time based on compile options. Add them to disabled-features.h and check them with cpu_feature_enabled().
Signed-off-by: Dave Hansen <[email protected]> --- b/arch/x86/include/asm/cpufeature.h | 16 ---------------- b/arch/x86/include/asm/disabled-features.h | 16 ++++++++++++++-- b/arch/x86/kernel/cpu/common.c | 2 +- b/arch/x86/kernel/cpu/mtrr/main.c | 6 +++--- 4 files changed, 18 insertions(+), 22 deletions(-) diff -puN arch/x86/include/asm/cpufeature.h~x86-disabled_features-addmore arch/x86/include/asm/cpufeature.h --- a/arch/x86/include/asm/cpufeature.h~x86-disabled_features-addmore 2014-07-02 09:16:21.437280769 -0700 +++ b/arch/x86/include/asm/cpufeature.h 2014-07-02 09:16:21.446281174 -0700 @@ -310,7 +310,6 @@ extern const char * const x86_power_flag } while (0) #define cpu_has_fpu boot_cpu_has(X86_FEATURE_FPU) -#define cpu_has_vme boot_cpu_has(X86_FEATURE_VME) #define cpu_has_de boot_cpu_has(X86_FEATURE_DE) #define cpu_has_pse boot_cpu_has(X86_FEATURE_PSE) #define cpu_has_tsc boot_cpu_has(X86_FEATURE_TSC) @@ -330,9 +329,6 @@ extern const char * const x86_power_flag #define cpu_has_ht boot_cpu_has(X86_FEATURE_HT) #define cpu_has_mp boot_cpu_has(X86_FEATURE_MP) #define cpu_has_nx boot_cpu_has(X86_FEATURE_NX) -#define cpu_has_k6_mtrr boot_cpu_has(X86_FEATURE_K6_MTRR) -#define cpu_has_cyrix_arr boot_cpu_has(X86_FEATURE_CYRIX_ARR) -#define cpu_has_centaur_mcr boot_cpu_has(X86_FEATURE_CENTAUR_MCR) #define cpu_has_xstore boot_cpu_has(X86_FEATURE_XSTORE) #define cpu_has_xstore_enabled boot_cpu_has(X86_FEATURE_XSTORE_EN) #define cpu_has_xcrypt boot_cpu_has(X86_FEATURE_XCRYPT) @@ -368,21 +364,9 @@ extern const char * const x86_power_flag #ifdef CONFIG_X86_64 -#undef cpu_has_vme -#define cpu_has_vme 0 - #undef cpu_has_mp #define cpu_has_mp 1 -#undef cpu_has_k6_mtrr -#define cpu_has_k6_mtrr 0 - -#undef cpu_has_cyrix_arr -#define cpu_has_cyrix_arr 0 - -#undef cpu_has_centaur_mcr -#define cpu_has_centaur_mcr 0 - #endif /* CONFIG_X86_64 */ #if __GNUC__ >= 4 diff -puN arch/x86/include/asm/disabled-features.h~x86-disabled_features-addmore arch/x86/include/asm/disabled-features.h --- a/arch/x86/include/asm/disabled-features.h~x86-disabled_features-addmore 2014-07-02 09:16:21.439280859 -0700 +++ b/arch/x86/include/asm/disabled-features.h 2014-07-02 09:16:21.447281218 -0700 @@ -10,13 +10,25 @@ * cpu_feature_enabled(). */ +#ifdef CONFIG_X86_64 +# define DISABLE_VME (1<<(X86_FEATURE_VME & 31)) +# define DISABLE_K6_MTRR (1<<(X86_FEATURE_K6_MTRR & 31)) +# define DISABLE_CYRIX_ARR (1<<(X86_FEATURE_CYRIX_ARR & 31)) +# define DISABLE_CENTAUR_MCR (1<<(X86_FEATURE_CENTAUR_MCR & 31)) +#else +# define DISABLE_VME 0 +# define DISABLE_K6_MTRR 0 +# define DISABLE_CYRIX_ARR 0 +# define DISABLE_CENTAUR_MCR 0 +#endif /* CONFIG_X86_64 */ + /* * Make sure to add features to the correct mask */ -#define DISABLED_MASK0 0 +#define DISABLED_MASK0 (DISABLE_VME) #define DISABLED_MASK1 0 #define DISABLED_MASK2 0 -#define DISABLED_MASK3 0 +#define DISABLED_MASK3 (DISABLE_CYRIX_ARR|DISABLE_CENTAUR_MCR|DISABLE_K6_MTRR) #define DISABLED_MASK4 0 #define DISABLED_MASK5 0 #define DISABLED_MASK6 0 diff -puN arch/x86/kernel/cpu/common.c~x86-disabled_features-addmore arch/x86/kernel/cpu/common.c --- a/arch/x86/kernel/cpu/common.c~x86-disabled_features-addmore 2014-07-02 09:16:21.442280992 -0700 +++ b/arch/x86/kernel/cpu/common.c 2014-07-02 09:16:21.447281218 -0700 @@ -1346,7 +1346,7 @@ void cpu_init(void) printk(KERN_INFO "Initializing CPU#%d\n", cpu); - if (cpu_has_vme || cpu_has_tsc || cpu_has_de) + if (cpu_feature_enabled(X86_FEATURE_VME) || cpu_has_tsc || cpu_has_de) clear_in_cr4(X86_CR4_VME|X86_CR4_PVI|X86_CR4_TSD|X86_CR4_DE); load_current_idt(); diff -puN arch/x86/kernel/cpu/mtrr/main.c~x86-disabled_features-addmore arch/x86/kernel/cpu/mtrr/main.c --- a/arch/x86/kernel/cpu/mtrr/main.c~x86-disabled_features-addmore 2014-07-02 09:16:21.442280992 -0700 +++ b/arch/x86/kernel/cpu/mtrr/main.c 2014-07-02 09:16:21.448281262 -0700 @@ -707,7 +707,7 @@ void __init mtrr_bp_init(void) } else { switch (boot_cpu_data.x86_vendor) { case X86_VENDOR_AMD: - if (cpu_has_k6_mtrr) { + if (cpu_feature_enabled(X86_FEATURE_K6_MTRR)) { /* Pre-Athlon (K6) AMD CPU MTRRs */ mtrr_if = mtrr_ops[X86_VENDOR_AMD]; size_or_mask = SIZE_OR_MASK_BITS(32); @@ -715,14 +715,14 @@ void __init mtrr_bp_init(void) } break; case X86_VENDOR_CENTAUR: - if (cpu_has_centaur_mcr) { + if (cpu_feature_enabled(X86_FEATURE_CENTAUR_MCR)) { mtrr_if = mtrr_ops[X86_VENDOR_CENTAUR]; size_or_mask = SIZE_OR_MASK_BITS(32); size_and_mask = 0; } break; case X86_VENDOR_CYRIX: - if (cpu_has_cyrix_arr) { + if (cpu_feature_enabled(X86_FEATURE_CYRIX_ARR)) { mtrr_if = mtrr_ops[X86_VENDOR_CYRIX]; size_or_mask = SIZE_OR_MASK_BITS(32); size_and_mask = 0; _ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
