avr32: Fix OCD refcounting bug

[linux-2.6-omap-h63xx.git] / arch / avr32 / kernel / process.c

diff --git a/arch/avr32/kernel/process.c b/arch/avr32/kernel/process.c
index 4e4181ed1c6d52a70a5308a50aa4a2a7761099f0..7f4af0b1e111448f4941fbb7d3ae94589f13a961 100644 (file)
--- a/arch/avr32/kernel/process.c
+++ b/arch/avr32/kernel/process.c
@@ -11,6 +11,7 @@
 #include <linux/fs.h>
 #include <linux/ptrace.h>
 #include <linux/reboot.h>
+#include <linux/tick.h>
 #include <linux/uaccess.h>
 #include <linux/unistd.h>
 
@@ -30,8 +31,10 @@ void cpu_idle(void)
 {
        /* endless idle loop with no priority at all */
        while (1) {
+               tick_nohz_stop_sched_tick();
                while (!need_resched())
                        cpu_idle_sleep();
+               tick_nohz_restart_sched_tick();
                preempt_enable_no_resched();
                schedule();
                preempt_disable();
@@ -55,8 +58,8 @@ void machine_power_off(void)
 
 void machine_restart(char *cmd)
 {
-       __mtdr(DBGREG_DC, DC_DBE);
-       __mtdr(DBGREG_DC, DC_RES);
+       ocd_write(DC, (1 << OCD_DC_DBE_BIT));
+       ocd_write(DC, (1 << OCD_DC_RES_BIT));
        while (1) ;
 }
 
@@ -103,7 +106,7 @@ EXPORT_SYMBOL(kernel_thread);
  */
 void exit_thread(void)
 {
-       /* nothing to do */
+       ocd_disable(current);
 }
 
 void flush_thread(void)
@@ -287,10 +290,11 @@ void show_regs_log_lvl(struct pt_regs *regs, const char *log_lvl)
               regs->sr & SR_N ? 'N' : 'n',
               regs->sr & SR_Z ? 'Z' : 'z',
               regs->sr & SR_C ? 'C' : 'c');
-       printk("%sMode bits: %c%c%c%c%c%c%c%c%c\n", log_lvl,
+       printk("%sMode bits: %c%c%c%c%c%c%c%c%c%c\n", log_lvl,
               regs->sr & SR_H ? 'H' : 'h',
-              regs->sr & SR_R ? 'R' : 'r',
               regs->sr & SR_J ? 'J' : 'j',
+              regs->sr & SR_DM ? 'M' : 'm',
+              regs->sr & SR_D ? 'D' : 'd',
               regs->sr & SR_EM ? 'E' : 'e',
               regs->sr & SR_I3M ? '3' : '.',
               regs->sr & SR_I2M ? '2' : '.',
@@ -330,13 +334,13 @@ int copy_thread(int nr, unsigned long clone_flags, unsigned long usp,
 {
        struct pt_regs *childregs;
 
-       childregs = ((struct pt_regs *)(THREAD_SIZE + (unsigned long)p->thread_info)) - 1;
+       childregs = ((struct pt_regs *)(THREAD_SIZE + (unsigned long)task_stack_page(p))) - 1;
        *childregs = *regs;
 
        if (user_mode(regs))
                childregs->sp = usp;
        else
-               childregs->sp = (unsigned long)p->thread_info + THREAD_SIZE;
+               childregs->sp = (unsigned long)task_stack_page(p) + THREAD_SIZE;
 
        childregs->r12 = 0; /* Set return value for child */
 
@@ -344,6 +348,10 @@ int copy_thread(int nr, unsigned long clone_flags, unsigned long usp,
        p->thread.cpu_context.ksp = (unsigned long)childregs;
        p->thread.cpu_context.pc = (unsigned long)ret_from_fork;
 
+       clear_tsk_thread_flag(p, TIF_DEBUG);
+       if ((clone_flags & CLONE_PTRACE) && test_thread_flag(TIF_DEBUG))
+               ocd_enable(p);
+
        return 0;
 }
 
@@ -403,7 +411,7 @@ unsigned long get_wchan(struct task_struct *p)
        if (!p || p == current || p->state == TASK_RUNNING)
                return 0;
 
-       stack_page = (unsigned long)p->thread_info;
+       stack_page = (unsigned long)task_stack_page(p);
        BUG_ON(!stack_page);
 
        /*