1 files changed, 8 insertions, 7 deletions

diff --git a/arch/arm/kernel/process.c b/arch/arm/kernel/process.c
index 90084a6de35a..c6dec5fc20aa 100644
--- a/arch/arm/kernel/process.c
+++ b/arch/arm/kernel/process.c
@@ -34,6 +34,7 @@
 #include <linux/leds.h>
 
 #include <asm/cacheflush.h>
+#include <asm/idmap.h>
 #include <asm/processor.h>
 #include <asm/thread_notify.h>
 #include <asm/stacktrace.h>
@@ -56,8 +57,6 @@ static const char *isa_modes[] = {
   "ARM" , "Thumb" , "Jazelle", "ThumbEE"
 };
 
-extern void setup_mm_for_reboot(void);
-
 static volatile int hlt_counter;
 
 void disable_hlt(void)
@@ -70,6 +69,7 @@ EXPORT_SYMBOL(disable_hlt);
 void enable_hlt(void)
 {
         hlt_counter--;
+        BUG_ON(hlt_counter < 0);
 }
 
 EXPORT_SYMBOL(enable_hlt);
@@ -376,17 +376,18 @@ asmlinkage void ret_from_fork(void) __asm__("ret_from_fork");
 
 int
 copy_thread(unsigned long clone_flags, unsigned long stack_start,
-            unsigned long stk_sz, struct task_struct *p, struct pt_regs *regs)
+            unsigned long stk_sz, struct task_struct *p)
 {
         struct thread_info *thread = task_thread_info(p);
         struct pt_regs *childregs = task_pt_regs(p);
 
         memset(&thread->cpu_context, 0, sizeof(struct cpu_context_save));
 
-        if (likely(regs)) {
-                *childregs = *regs;
+        if (likely(!(p->flags & PF_KTHREAD))) {
+                *childregs = *current_pt_regs();
                 childregs->ARM_r0 = 0;
-                childregs->ARM_sp = stack_start;
+                if (stack_start)
+                        childregs->ARM_sp = stack_start;
         } else {
                 memset(childregs, 0, sizeof(struct pt_regs));
                 thread->cpu_context.r4 = stk_sz;
@@ -399,7 +400,7 @@ copy_thread(unsigned long clone_flags, unsigned long stack_start,
         clear_ptrace_hw_breakpoint(p);
 
         if (clone_flags & CLONE_SETTLS)
-                thread->tp_value = regs->ARM_r3;
+                thread->tp_value = childregs->ARM_r3;
 
         thread_notify(THREAD_NOTIFY_COPY, thread);