---

yaml --- r: 80148 b: refs/heads/master c: 707fa8e h: refs/heads/master v: v3
git-mirror · Jan 30, 2008 · 8f6fd42 · 8f6fd42
1 parent 06d706a
commit 8f6fd42
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Showing 4 changed files with 5 additions and 6 deletions.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: de4218634e3df6d73a3e6cdfdf3a17fa3bc7e013
+refs/heads/master: 707fa8ed923b1b6a3d7af0d386b0b3abad28ed19
diff --git a/trunk/arch/x86/kernel/cpu/intel.c b/trunk/arch/x86/kernel/cpu/intel.c
@@ -203,9 +203,10 @@ static void __cpuinit init_intel(struct cpuinfo_x86 *c)
 	}
 #endif
 
+	if (cpu_has_xmm)
+		set_bit(X86_FEATURE_LFENCE_RDTSC, c->x86_capability);
 	if (c->x86 == 15) {
 		set_bit(X86_FEATURE_P4, c->x86_capability);
-		set_bit(X86_FEATURE_SYNC_RDTSC, c->x86_capability);
 	}
 	if (c->x86 == 6) 
 		set_bit(X86_FEATURE_P3, c->x86_capability);

diff --git a/trunk/arch/x86/kernel/setup_64.c b/trunk/arch/x86/kernel/setup_64.c
@@ -888,10 +888,7 @@ static void __cpuinit init_intel(struct cpuinfo_x86 *c)
 		set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC);
 	if (c->x86 == 6)
 		set_cpu_cap(c, X86_FEATURE_REP_GOOD);
-	if (c->x86 == 15)
-		set_cpu_cap(c, X86_FEATURE_SYNC_RDTSC);
-	else
-		clear_cpu_cap(c, X86_FEATURE_SYNC_RDTSC);
+	set_cpu_cap(c, X86_FEATURE_LFENCE_RDTSC);
 	c->x86_max_cores = intel_num_cpu_cores(c);
 
 	srat_detect_node();

diff --git a/trunk/include/asm-x86/cpufeature.h b/trunk/include/asm-x86/cpufeature.h
@@ -80,6 +80,7 @@
 #define X86_FEATURE_SYNC_RDTSC	(3*32+15)  /* RDTSC synchronizes the CPU */
 #define X86_FEATURE_REP_GOOD	(3*32+16) /* rep microcode works well on this CPU */
 #define X86_FEATURE_MFENCE_RDTSC (3*32+17) /* Mfence synchronizes RDTSC */
+#define X86_FEATURE_LFENCE_RDTSC (3*32+18) /* Lfence synchronizes RDTSC */
 
 /* Intel-defined CPU features, CPUID level 0x00000001 (ecx), word 4 */
 #define X86_FEATURE_XMM3	(4*32+ 0) /* Streaming SIMD Extensions-3 */