fedora core 6 1.2949 + vserver 2.2.0

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

diff --git a/arch/sparc/kernel/process.c b/arch/sparc/kernel/process.c
index 143fe2f..4dd490e 100644 (file)
--- a/arch/sparc/kernel/process.c
+++ b/arch/sparc/kernel/process.c
@@ -22,7 +22,6 @@
 #include <linux/slab.h>
 #include <linux/user.h>
 #include <linux/a.out.h>
-#include <linux/config.h>
 #include <linux/smp.h>
 #include <linux/smp_lock.h>
 #include <linux/reboot.h>
@@ -54,7 +53,8 @@ void (*pm_idle)(void);
  * This is done via auxio, but could be used as a fallback
  * handler when auxio is not present-- unused for now...
  */
-void (*pm_power_off)(void);
+void (*pm_power_off)(void) = machine_power_off;
+EXPORT_SYMBOL(pm_power_off);
 
 /*
  * sysctl - toggle power-off restriction for serial console 
@@ -67,13 +67,6 @@ extern void fpsave(unsigned long *, unsigned long *, void *, unsigned long *);
 struct task_struct *last_task_used_math = NULL;
 struct thread_info *current_set[NR_CPUS];
 
-/*
- * default_idle is new in 2.5. XXX Review, currently stolen from sparc64.
- */
-void default_idle(void)
-{
-}
-
 #ifndef CONFIG_SMP
 
 #define SUN4C_FAULT_HIGH 100
@@ -83,9 +76,6 @@ void default_idle(void)
  */
 void cpu_idle(void)
 {
-       if (current->pid != 0)
-               goto out;
-
        /* endless idle loop with no priority at all */
        for (;;) {
                if (ARCH_SUN4C_SUN4) {
@@ -95,12 +85,11 @@ void cpu_idle(void)
                        static unsigned long fps;
                        unsigned long now;
                        unsigned long faults;
-                       unsigned long flags;
 
                        extern unsigned long sun4c_kernel_faults;
                        extern void sun4c_grow_kernel_ring(void);
 
-                       local_irq_save(flags);
+                       local_irq_disable();
                        now = jiffies;
                        count -= (now - last_jiffies);
                        last_jiffies = now;
@@ -116,18 +105,21 @@ void cpu_idle(void)
                                        sun4c_grow_kernel_ring();
                                }
                        }
-                       local_irq_restore(flags);
+                       local_irq_enable();
                }
 
-               while((!need_resched()) && pm_idle) {
-                       (*pm_idle)();
+               if (pm_idle) {
+                       while (!need_resched())
+                               (*pm_idle)();
+               } else {
+                       while (!need_resched())
+                               cpu_relax();
                }
-
+               preempt_enable_no_resched();
                schedule();
+               preempt_disable();
                check_pgt_cache();
        }
-out:
-       return;
 }
 
 #else
@@ -135,13 +127,15 @@ out:
 /* This is being executed in task 0 'user space'. */
 void cpu_idle(void)
 {
+        set_thread_flag(TIF_POLLING_NRFLAG);
        /* endless idle loop with no priority at all */
        while(1) {
-               if(need_resched()) {
-                       schedule();
-                       check_pgt_cache();
-               }
-               barrier(); /* or else gcc optimizes... */
+               while (!need_resched())
+                       cpu_relax();
+               preempt_enable_no_resched();
+               schedule();
+               preempt_disable();
+               check_pgt_cache();
        }
 }
 
@@ -163,8 +157,6 @@ void machine_halt(void)
        panic("Halt failed!");
 }
 
-EXPORT_SYMBOL(machine_halt);
-
 void machine_restart(char * cmd)
 {
        char *p;
@@ -185,8 +177,6 @@ void machine_restart(char * cmd)
        panic("Reboot failed!");
 }
 
-EXPORT_SYMBOL(machine_restart);
-
 void machine_power_off(void)
 {
 #ifdef CONFIG_SUN_AUXIO
@@ -196,8 +186,6 @@ void machine_power_off(void)
        machine_halt();
 }
 
-EXPORT_SYMBOL(machine_power_off);
-
 static DEFINE_SPINLOCK(sparc_backtrace_lock);
 
 void __show_backtrace(unsigned long fp)
@@ -314,7 +302,7 @@ void show_stack(struct task_struct *tsk, unsigned long *_ksp)
        int count = 0;
 
        if (tsk != NULL)
-               task_base = (unsigned long) tsk->thread_info;
+               task_base = (unsigned long) task_stack_page(tsk);
        else
                task_base = (unsigned long) current_thread_info();
 
@@ -333,12 +321,23 @@ void show_stack(struct task_struct *tsk, unsigned long *_ksp)
        printk("\n");
 }
 
+void dump_stack(void)
+{
+       unsigned long *ksp;
+
+       __asm__ __volatile__("mov       %%fp, %0"
+                            : "=r" (ksp));
+       show_stack(current, ksp);
+}
+
+EXPORT_SYMBOL(dump_stack);
+
 /*
  * Note: sparc64 has a pretty intricated thread_saved_pc, check it out.
  */
 unsigned long thread_saved_pc(struct task_struct *tsk)
 {
-       return tsk->thread_info->kpc;
+       return task_thread_info(tsk)->kpc;
 }
 
 /*
@@ -393,7 +392,7 @@ void flush_thread(void)
                /* We must fixup kregs as well. */
                /* XXX This was not fixed for ti for a while, worked. Unused? */
                current->thread.kregs = (struct pt_regs *)
-                   ((char *)current->thread_info + (THREAD_SIZE - TRACEREG_SZ));
+                   (task_stack_page(current) + (THREAD_SIZE - TRACEREG_SZ));
        }
 }
 
@@ -460,7 +459,7 @@ int copy_thread(int nr, unsigned long clone_flags, unsigned long sp,
                unsigned long unused,
                struct task_struct *p, struct pt_regs *regs)
 {
-       struct thread_info *ti = p->thread_info;
+       struct thread_info *ti = task_thread_info(p);
        struct pt_regs *childregs;
        char *new_stack;
 
@@ -483,7 +482,7 @@ int copy_thread(int nr, unsigned long clone_flags, unsigned long sp,
         *  V                      V (stk.fr.) V  (pt_regs)  { (stk.fr.) }
         *  +----- - - - - - ------+===========+============={+==========}+
         */
-       new_stack = (char*)ti + THREAD_SIZE;
+       new_stack = task_stack_page(p) + THREAD_SIZE;
        if (regs->psr & PSR_PS)
                new_stack -= STACKFRAME_SZ;
        new_stack -= STACKFRAME_SZ + TRACEREG_SZ;
@@ -707,7 +706,8 @@ pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
                             /* Notreached by child. */
                             "1: mov %%o0, %0\n\t" :
                             "=r" (retval) :
-                            "i" (__NR_clone), "r" (flags | CLONE_VM | CLONE_UNTRACED),
+                            "i" (__NR_clone), "r" (flags |
+                                       CLONE_VM | CLONE_UNTRACED | CLONE_KTHREAD),
                             "i" (__NR_exit),  "r" (fn), "r" (arg) :
                             "g1", "g2", "g3", "o0", "o1", "memory", "cc");
        return retval;
@@ -725,7 +725,7 @@ unsigned long get_wchan(struct task_struct *task)
             task->state == TASK_RUNNING)
                goto out;
 
-       fp = task->thread_info->ksp + bias;
+       fp = task_thread_info(task)->ksp + bias;
        do {
                /* Bogus frame pointer? */
                if (fp < (task_base + sizeof(struct thread_info)) ||