Merge branches 'x86/alternatives', 'x86/cleanups', 'x86/commandline', 'x86/crashdump...

[linux-2.6.git] / arch / x86 / kernel / process.c

diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
index 7fc4d5b0a6a0f99a4d1d9c4df685a5a4d3a135bb..ec7a2ba9bce8062d870448ce5a5292b81b0d6dd8 100644 (file)
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -185,7 +185,8 @@ static void mwait_idle(void)
 static void poll_idle(void)
 {
        local_irq_enable();
-       cpu_relax();
+       while (!need_resched())
+               cpu_relax();
 }
 
 /*
@@ -246,6 +247,14 @@ static int __cpuinit check_c1e_idle(const struct cpuinfo_x86 *c)
        return 1;
 }
 
+static cpumask_t c1e_mask = CPU_MASK_NONE;
+static int c1e_detected;
+
+void c1e_remove_cpu(int cpu)
+{
+       cpu_clear(cpu, c1e_mask);
+}
+
 /*
  * C1E aware idle routine. We check for C1E active in the interrupt
  * pending message MSR. If we detect C1E, then we handle it the same
@@ -253,9 +262,6 @@ static int __cpuinit check_c1e_idle(const struct cpuinfo_x86 *c)
  */
 static void c1e_idle(void)
 {
-       static cpumask_t c1e_mask = CPU_MASK_NONE;
-       static int c1e_detected;
-
        if (need_resched())
                return;
 
@@ -265,8 +271,10 @@ static void c1e_idle(void)
                rdmsr(MSR_K8_INT_PENDING_MSG, lo, hi);
                if (lo & K8_INTP_C1E_ACTIVE_MASK) {
                        c1e_detected = 1;
-                       mark_tsc_unstable("TSC halt in C1E");
-                       printk(KERN_INFO "System has C1E enabled\n");
+                       if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC))
+                               mark_tsc_unstable("TSC halt in AMD C1E");
+                       printk(KERN_INFO "System has AMD C1E enabled\n");
+                       set_cpu_cap(&boot_cpu_data, X86_FEATURE_AMDC1E);
                }
        }