arch: Cleanup enable/disable_hlt

enable/disable_hlt() does not need to be exported and can be killed on
architectures which do not use it at all.

Signed-off-by: Thomas Gleixner <[e-mail]>
Cc: Linus Torvalds <[e-mail]>
Cc: Rusty Russell <[e-mail]>
Cc: Paul McKenney <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Reviewed-by: Cc: Srivatsa S. Bhat <[e-mail]>
Cc: Magnus Damm <[e-mail]>
Link: http://lkml.kernel.org/r/[e-mail]
Signed-off-by: Thomas Gleixner <[e-mail]>

arch/arm/kernel/process.c

···
 	hlt_counter++;
 }
 
-EXPORT_SYMBOL(disable_hlt);
-
 void enable_hlt(void)
 {
 	hlt_counter--;
 	BUG_ON(hlt_counter < 0);
 }
-
-EXPORT_SYMBOL(enable_hlt);
 
 static int __init nohlt_setup(char *__unused)
 {

arch/cris/arch-v32/kernel/process.c

···
 
 extern void stop_watchdog(void);
 
-extern int cris_hlt_counter;
-
 /* We use this if we don't have any better idle routine. */
 void default_idle(void)
 {
 	local_irq_disable();
-	if (!need_resched() && !cris_hlt_counter) {
-	        /* Halt until exception. */
+	if (!need_resched()) {
+		/* Halt until exception. */
 		__asm__ volatile("ei    \n\t"
-                                 "halt      ");
+				 "halt      ");
 	}
 	local_irq_enable();
 }

arch/cris/include/asm/processor.h

···
 
 #define cpu_relax()     barrier()
 
-/*
- * disable hlt during certain critical i/o operations
- */
-#define HAVE_DISABLE_HLT
-void disable_hlt(void);
-void enable_hlt(void);
-
 void default_idle(void);
 
 #endif /* __ASM_CRIS_PROCESSOR_H */

arch/cris/kernel/process.c

···
 
 //#define DEBUG
 
-/*
- * The hlt_counter, disable_hlt and enable_hlt is just here as a hook if
- * there would ever be a halt sequence (for power save when idle) with
- * some largish delay when halting or resuming *and* a driver that can't
- * afford that delay.  The hlt_counter would then be checked before
- * executing the halt sequence, and the driver marks the unhaltable
- * region by enable_hlt/disable_hlt.
- */
-
-int cris_hlt_counter=0;
-
-void disable_hlt(void)
-{
-	cris_hlt_counter++;
-}
-
-EXPORT_SYMBOL(disable_hlt);
-
-void enable_hlt(void)
-{
-	cris_hlt_counter--;
-}
-
-EXPORT_SYMBOL(enable_hlt);
- 
 extern void default_idle(void);
 
 void (*pm_power_off)(void);

arch/microblaze/include/asm/processor.h

···
 #  define STACK_TOP	TASK_SIZE
 #  define STACK_TOP_MAX	STACK_TOP
 
-void disable_hlt(void);
-void enable_hlt(void);
 void default_idle(void);
 
 #ifdef CONFIG_DEBUG_FS

arch/microblaze/kernel/process.c

···
 
 static int hlt_counter = 1;
 
-void disable_hlt(void)
-{
-	hlt_counter++;
-}
-EXPORT_SYMBOL(disable_hlt);
-
-void enable_hlt(void)
-{
-	hlt_counter--;
-}
-EXPORT_SYMBOL(enable_hlt);
-
 static int __init nohlt_setup(char *__unused)
 {
 	hlt_counter = 1;

arch/mn10300/kernel/smp.c

···
 	int timeout;
 
 #ifdef CONFIG_HOTPLUG_CPU
-	if (num_online_cpus() == 1)
-		disable_hlt();
 	if (sleep_mode[cpu])
 		run_wakeup_cpu(cpu);
 #endif /* CONFIG_HOTPLUG_CPU */
···
 void __cpu_die(unsigned int cpu)
 {
 	run_sleep_cpu(cpu);
-
-	if (num_online_cpus() == 1)
-		enable_hlt();
 }
 
 #ifdef CONFIG_MN10300_CACHE_ENABLED