git » linux-kernel » commit a8d6829

diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
index 2e2247117f6..d8c2a299bfe 100644
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -272,6 +272,7 @@ static void c1e_idle(void)
 			c1e_detected = 1;
 			mark_tsc_unstable("TSC halt in C1E");
 			printk(KERN_INFO "System has C1E enabled\n");
+			set_cpu_cap(&boot_cpu_data, X86_FEATURE_AMDC1E);
 		}
 	}
 
diff --git a/include/asm-x86/acpi.h b/include/asm-x86/acpi.h
index 635d764dc13..35d1743b57a 100644
--- a/include/asm-x86/acpi.h
+++ b/include/asm-x86/acpi.h
@@ -140,6 +140,8 @@ static inline unsigned int acpi_processor_cstate_check(unsigned int max_cstate)
 	    boot_cpu_data.x86_model <= 0x05 &&
 	    boot_cpu_data.x86_mask < 0x0A)
 		return 1;
+	else if (boot_cpu_has(X86_FEATURE_AMDC1E))
+		return 1;
 	else
 		return max_cstate;
 }
diff --git a/include/asm-x86/cpufeature.h b/include/asm-x86/cpufeature.h
index 9489283a4bc..cfcfb0a806b 100644
--- a/include/asm-x86/cpufeature.h
+++ b/include/asm-x86/cpufeature.h
@@ -81,6 +81,7 @@
 #define X86_FEATURE_LFENCE_RDTSC (3*32+18) /* Lfence synchronizes RDTSC */
 #define X86_FEATURE_11AP	(3*32+19) /* Bad local APIC aka 11AP */
 #define X86_FEATURE_NOPL	(3*32+20) /* The NOPL (0F 1F) instructions */
+#define X86_FEATURE_AMDC1E	(3*32+21) /* AMD C1E detected */
 
 /* Intel-defined CPU features, CPUID level 0x00000001 (ecx), word 4 */
 #define X86_FEATURE_XMM3	(4*32+ 0) /* Streaming SIMD Extensions-3 */