MIPS: Make flush_thread

Avoids function calls to an empty function.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/include/asm/processor.h

@@ -355,6 +355,10 @@ extern unsigned long thread_saved_pc(struct task_struct *tsk);
  */
 extern void start_thread(struct pt_regs * regs, unsigned long pc, unsigned long sp);
 
+static inline void flush_thread(void)
+{
+}
+
 unsigned long get_wchan(struct task_struct *p);
 
 #define __KSTK_TOS(tsk) ((unsigned long)task_stack_page(tsk) + \

arch/mips/kernel/process.c

@@ -77,10 +77,6 @@ void exit_thread(void)
 {
 }
 
-void flush_thread(void)
-{
-}
-
 int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
 {
 	/*