Messages in this thread Patch in this message | | | Date | Thu, 17 Jan 2008 23:59:21 -0500 | From | Kyle McMartin <> | Subject | [PATCH] x86: make clflush a required feature on x86_64 |
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Hopefully nobody will be stupid enough to implement a cpu without it. Frankly, it seems safe enough given we already require SSE2.
This means the compiler can optimise away "if (!cpu_has_clflush)" blocks.
Signed-off-by: Kyle McMartin <kyle@mcmartin.ca> --- include/asm-x86/cpufeature_64.h | 3 +++ include/asm-x86/required-features.h | 4 +++- 2 files changed, 6 insertions(+), 1 deletions(-)
diff --git a/include/asm-x86/cpufeature_64.h b/include/asm-x86/cpufeature_64.h index e18496b..ef11d27 100644 --- a/include/asm-x86/cpufeature_64.h +++ b/include/asm-x86/cpufeature_64.h @@ -18,6 +18,9 @@ #undef cpu_has_mp #define cpu_has_mp 1 /* XXX */ +#undef cpu_has_clflush +#define cpu_has_clflush 1 + #undef cpu_has_k6_mtrr #define cpu_has_k6_mtrr 0 diff --git a/include/asm-x86/required-features.h b/include/asm-x86/required-features.h index 7400d3a..cc27664 100644 --- a/include/asm-x86/required-features.h +++ b/include/asm-x86/required-features.h @@ -45,6 +45,7 @@ #define NEED_XMM (1<<(X86_FEATURE_XMM & 31)) #define NEED_XMM2 (1<<(X86_FEATURE_XMM2 & 31)) #define NEED_LM (1<<(X86_FEATURE_LM & 31)) +#define NEED_CLFLSH (1<<(X86_FEATURE_CLFLSH & 31)) #else #define NEED_PSE 0 #define NEED_MSR 0 @@ -53,11 +54,12 @@ #define NEED_XMM 0 #define NEED_XMM2 0 #define NEED_LM 0 +#define NEED_CLFLSH 0 #endif #define REQUIRED_MASK0 (NEED_FPU|NEED_PSE|NEED_MSR|NEED_PAE|\ NEED_CX8|NEED_PGE|NEED_FXSR|NEED_CMOV|\ - NEED_XMM|NEED_XMM2) + NEED_XMM|NEED_XMM2|NEED_CLFLSH) #define SSE_MASK (NEED_XMM|NEED_XMM2) #define REQUIRED_MASK1 (NEED_LM|NEED_3DNOW) -- 1.5.3.7
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