1 files changed, 4 insertions, 114 deletions

diff --git a/arch/x86/kernel/process_32.c b/arch/x86/kernel/process_32.c
index 77de848bd1fb..f8476dfbb60d 100644
--- a/arch/x86/kernel/process_32.c
+++ b/arch/x86/kernel/process_32.c
@@ -111,12 +111,10 @@ void default_idle(void)
                  */
                 smp_mb();
 
-                local_irq_disable();
-                if (!need_resched()) {
+                if (!need_resched())
                         safe_halt();    /* enables interrupts racelessly */
-                        local_irq_disable();
-                }
-                local_irq_enable();
+                else
+                        local_irq_enable();
                 current_thread_info()->status |= TS_POLLING;
         } else {
                 local_irq_enable();
@@ -128,17 +126,6 @@ void default_idle(void)
 EXPORT_SYMBOL(default_idle);
 #endif
 
-/*
- * On SMP it's slightly faster (but much more power-consuming!)
- * to poll the ->work.need_resched flag instead of waiting for the
- * cross-CPU IPI to arrive. Use this option with caution.
- */
-static void poll_idle(void)
-{
-        local_irq_enable();
-        cpu_relax();
-}
-
 #ifdef CONFIG_HOTPLUG_CPU
 #include <asm/nmi.h>
 /* We don't actually take CPU down, just spin without interrupts. */
@@ -196,6 +183,7 @@ void cpu_idle(void)
                         if (cpu_is_offline(cpu))
                                 play_dead();
 
+                        local_irq_disable();
                         __get_cpu_var(irq_stat).idle_timestamp = jiffies;
                         idle();
                 }
@@ -206,104 +194,6 @@ void cpu_idle(void)
         }
 }
 
-static void do_nothing(void *unused)
-{
-}
-
-/*
- * cpu_idle_wait - Used to ensure that all the CPUs discard old value of
- * pm_idle and update to new pm_idle value. Required while changing pm_idle
- * handler on SMP systems.
- *
- * Caller must have changed pm_idle to the new value before the call. Old
- * pm_idle value will not be used by any CPU after the return of this function.
- */
-void cpu_idle_wait(void)
-{
-        smp_mb();
-        /* kick all the CPUs so that they exit out of pm_idle */
-        smp_call_function(do_nothing, NULL, 0, 1);
-}
-EXPORT_SYMBOL_GPL(cpu_idle_wait);
-
-/*
- * This uses new MONITOR/MWAIT instructions on P4 processors with PNI,
- * which can obviate IPI to trigger checking of need_resched.
- * We execute MONITOR against need_resched and enter optimized wait state
- * through MWAIT. Whenever someone changes need_resched, we would be woken
- * up from MWAIT (without an IPI).
- *
- * New with Core Duo processors, MWAIT can take some hints based on CPU
- * capability.
- */
-void mwait_idle_with_hints(unsigned long ax, unsigned long cx)
-{
-        if (!need_resched()) {
-                __monitor((void *)&current_thread_info()->flags, 0, 0);
-                smp_mb();
-                if (!need_resched())
-                        __sti_mwait(ax, cx);
-                else
-                        local_irq_enable();
-        } else
-                local_irq_enable();
-}
-
-/* Default MONITOR/MWAIT with no hints, used for default C1 state */
-static void mwait_idle(void)
-{
-        local_irq_enable();
-        mwait_idle_with_hints(0, 0);
-}
-
-static int __cpuinit mwait_usable(const struct cpuinfo_x86 *c)
-{
-        if (force_mwait)
-                return 1;
-        /* Any C1 states supported? */
-        return c->cpuid_level >= 5 && ((cpuid_edx(5) >> 4) & 0xf) > 0;
-}
-
-void __cpuinit select_idle_routine(const struct cpuinfo_x86 *c)
-{
-        static int selected;
-
-        if (selected)
-                return;
-#ifdef CONFIG_X86_SMP
-        if (pm_idle == poll_idle && smp_num_siblings > 1) {
-                printk(KERN_WARNING "WARNING: polling idle and HT enabled,"
-                        " performance may degrade.\n");
-        }
-#endif
-        if (cpu_has(c, X86_FEATURE_MWAIT) && mwait_usable(c)) {
-                /*
-                 * Skip, if setup has overridden idle.
-                 * One CPU supports mwait => All CPUs supports mwait
-                 */
-                if (!pm_idle) {
-                        printk(KERN_INFO "using mwait in idle threads.\n");
-                        pm_idle = mwait_idle;
-                }
-        }
-        selected = 1;
-}
-
-static int __init idle_setup(char *str)
-{
-        if (!strcmp(str, "poll")) {
-                printk("using polling idle threads.\n");
-                pm_idle = poll_idle;
-        } else if (!strcmp(str, "mwait"))
-                force_mwait = 1;
-        else
-                return -1;
-
-        boot_option_idle_override = 1;
-        return 0;
-}
-early_param("idle", idle_setup);
-
 void __show_registers(struct pt_regs *regs, int all)
 {
         unsigned long cr0 = 0L, cr2 = 0L, cr3 = 0L, cr4 = 0L;