1 files changed, 47 insertions, 14 deletions

diff --git a/arch/mn10300/kernel/process.c b/arch/mn10300/kernel/process.c
index f48373e2bc1c..0d0f8049a17b 100644
--- a/arch/mn10300/kernel/process.c
+++ b/arch/mn10300/kernel/process.c
@@ -57,6 +57,7 @@ unsigned long thread_saved_pc(struct task_struct *tsk)
 void (*pm_power_off)(void);
 EXPORT_SYMBOL(pm_power_off);
 
+#if !defined(CONFIG_SMP) || defined(CONFIG_HOTPLUG_CPU)
 /*
  * we use this if we don't have any better idle routine
  */
@@ -69,6 +70,35 @@ static void default_idle(void)
                 local_irq_enable();
 }
 
+#else /* !CONFIG_SMP || CONFIG_HOTPLUG_CPU  */
+/*
+ * 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 inline void poll_idle(void)
+{
+        int oldval;
+
+        local_irq_enable();
+
+        /*
+         * Deal with another CPU just having chosen a thread to
+         * run here:
+         */
+        oldval = test_and_clear_thread_flag(TIF_NEED_RESCHED);
+
+        if (!oldval) {
+                set_thread_flag(TIF_POLLING_NRFLAG);
+                while (!need_resched())
+                        cpu_relax();
+                clear_thread_flag(TIF_POLLING_NRFLAG);
+        } else {
+                set_need_resched();
+        }
+}
+#endif /* !CONFIG_SMP || CONFIG_HOTPLUG_CPU */
+
 /*
  * the idle thread
  * - there's no useful work to be done, so just try to conserve power and have
@@ -77,8 +107,6 @@ static void default_idle(void)
  */
 void cpu_idle(void)
 {
-        int cpu = smp_processor_id();
-
         /* endless idle loop with no priority at all */
         for (;;) {
                 while (!need_resched()) {
@@ -86,10 +114,13 @@ void cpu_idle(void)
 
                         smp_rmb();
                         idle = pm_idle;
-                        if (!idle)
+                        if (!idle) {
+#if defined(CONFIG_SMP) && !defined(CONFIG_HOTPLUG_CPU)
+                                idle = poll_idle;
+#else  /* CONFIG_SMP && !CONFIG_HOTPLUG_CPU */
                                 idle = default_idle;
-
-                        irq_stat[cpu].idle_timestamp = jiffies;
+#endif /* CONFIG_SMP && !CONFIG_HOTPLUG_CPU */
+                        }
                         idle();
                 }
 
@@ -197,6 +228,7 @@ int copy_thread(unsigned long clone_flags,
                 unsigned long c_usp, unsigned long ustk_size,
                 struct task_struct *p, struct pt_regs *kregs)
 {
+        struct thread_info *ti = task_thread_info(p);
         struct pt_regs *c_uregs, *c_kregs, *uregs;
         unsigned long c_ksp;
 
@@ -217,7 +249,7 @@ int copy_thread(unsigned long clone_flags,
 
         /* the new TLS pointer is passed in as arg #5 to sys_clone() */
         if (clone_flags & CLONE_SETTLS)
-                c_uregs->e2 = __frame->d3;
+                c_uregs->e2 = current_frame()->d3;
 
         /* set up the return kernel frame if called from kernel_thread() */
         c_kregs = c_uregs;
@@ -235,7 +267,7 @@ int copy_thread(unsigned long clone_flags,
         }
 
         /* set up things up so the scheduler can start the new task */
-        p->thread.__frame = c_kregs;
+        ti->frame       = c_kregs;
         p->thread.a3    = (unsigned long) c_kregs;
         p->thread.sp    = c_ksp;
         p->thread.pc    = (unsigned long) ret_from_fork;
@@ -247,25 +279,26 @@ int copy_thread(unsigned long clone_flags,
 
 /*
  * clone a process
- * - tlsptr is retrieved by copy_thread() from __frame->d3
+ * - tlsptr is retrieved by copy_thread() from current_frame()->d3
  */
 asmlinkage long sys_clone(unsigned long clone_flags, unsigned long newsp,
                           int __user *parent_tidptr, int __user *child_tidptr,
                           int __user *tlsptr)
 {
-        return do_fork(clone_flags, newsp ?: __frame->sp, __frame, 0,
-                       parent_tidptr, child_tidptr);
+        return do_fork(clone_flags, newsp ?: current_frame()->sp,
+                       current_frame(), 0, parent_tidptr, child_tidptr);
 }
 
 asmlinkage long sys_fork(void)
 {
-        return do_fork(SIGCHLD, __frame->sp, __frame, 0, NULL, NULL);
+        return do_fork(SIGCHLD, current_frame()->sp,
+                       current_frame(), 0, NULL, NULL);
 }
 
 asmlinkage long sys_vfork(void)
 {
-        return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, __frame->sp, __frame,
-                       0, NULL, NULL);
+        return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, current_frame()->sp,
+                       current_frame(), 0, NULL, NULL);
 }
 
 asmlinkage long sys_execve(const char __user *name,
@@ -279,7 +312,7 @@ asmlinkage long sys_execve(const char __user *name,
         error = PTR_ERR(filename);
         if (IS_ERR(filename))
                 return error;
-        error = do_execve(filename, argv, envp, __frame);
+        error = do_execve(filename, argv, envp, current_frame());
         putname(filename);
         return error;
 }