[PATCH] i386/x86_64: ACPI cpu_idle_wait() fix

[deliverable/linux.git] / arch / i386 / kernel / process.c

diff --git a/arch/i386/kernel/process.c b/arch/i386/kernel/process.c
index 8c190ca7ae4494b980b01c8a4c88eee291a3fd45..dd53c58f64f1bd944dd65190fc5d8f98bf6c8643 100644 (file)
--- a/arch/i386/kernel/process.c
+++ b/arch/i386/kernel/process.c
@@ -205,7 +205,7 @@ void cpu_idle(void)
 void cpu_idle_wait(void)
 {
        unsigned int cpu, this_cpu = get_cpu();
-       cpumask_t map;
+       cpumask_t map, tmp = current->cpus_allowed;
 
        set_cpus_allowed(current, cpumask_of_cpu(this_cpu));
        put_cpu();
@@ -227,6 +227,8 @@ void cpu_idle_wait(void)
                }
                cpus_and(map, map, cpu_online_map);
        } while (!cpus_empty(map));
+
+       set_cpus_allowed(current, tmp);
 }
 EXPORT_SYMBOL_GPL(cpu_idle_wait);
 
@@ -236,20 +238,28 @@ EXPORT_SYMBOL_GPL(cpu_idle_wait);
  * 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.
  */
-static void mwait_idle(void)
+void mwait_idle_with_hints(unsigned long eax, unsigned long ecx)
 {
-       local_irq_enable();
-
-       while (!need_resched()) {
+       if (!need_resched()) {
                __monitor((void *)&current_thread_info()->flags, 0, 0);
                smp_mb();
-               if (need_resched())
-                       break;
-               __mwait(0, 0);
+               if (!need_resched())
+                       __mwait(eax, ecx);
        }
 }
 
+/* Default MONITOR/MWAIT with no hints, used for default C1 state */
+static void mwait_idle(void)
+{
+       local_irq_enable();
+       while (!need_resched())
+               mwait_idle_with_hints(0, 0);
+}
+
 void __devinit select_idle_routine(const struct cpuinfo_x86 *c)
 {
        if (cpu_has(c, X86_FEATURE_MWAIT)) {
@@ -297,9 +307,9 @@ void show_regs(struct pt_regs * regs)
        if (user_mode_vm(regs))
                printk(" ESP: %04x:%08lx",0xffff & regs->xss,regs->esp);
        printk(" EFLAGS: %08lx    %s  (%s %.*s)\n",
-              regs->eflags, print_tainted(), system_utsname.release,
-              (int)strcspn(system_utsname.version, " "),
-              system_utsname.version);
+              regs->eflags, print_tainted(), init_utsname()->release,
+              (int)strcspn(init_utsname()->version, " "),
+              init_utsname()->version);
        printk("EAX: %08lx EBX: %08lx ECX: %08lx EDX: %08lx\n",
                regs->eax,regs->ebx,regs->ecx,regs->edx);
        printk("ESI: %08lx EDI: %08lx EBP: %08lx",
@@ -425,13 +435,12 @@ int copy_thread(int nr, unsigned long clone_flags, unsigned long esp,
 
        tsk = current;
        if (unlikely(test_tsk_thread_flag(tsk, TIF_IO_BITMAP))) {
-               p->thread.io_bitmap_ptr = kmalloc(IO_BITMAP_BYTES, GFP_KERNEL);
+               p->thread.io_bitmap_ptr = kmemdup(tsk->thread.io_bitmap_ptr,
+                                               IO_BITMAP_BYTES, GFP_KERNEL);
                if (!p->thread.io_bitmap_ptr) {
                        p->thread.io_bitmap_max = 0;
                        return -ENOMEM;
                }
-               memcpy(p->thread.io_bitmap_ptr, tsk->thread.io_bitmap_ptr,
-                       IO_BITMAP_BYTES);
                set_tsk_thread_flag(p, TIF_IO_BITMAP);
        }