[patch 01/34] arch: Cleanup enable/disable_hlt

Thomas Gleixner
2013-03-21T21:53:06Z

[-- Attachment #1: arch-cleanup-disable-hlt.patch --]
[-- Type: text/plain, Size: 4841 bytes --]

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 <tglx@linutronix.de>
---
arch/arm/kernel/process.c | 4 ----
arch/cris/arch-v32/kernel/process.c | 8 +++-----
arch/cris/include/asm/processor.h | 7 -------
arch/cris/kernel/process.c | 25 -------------------------
arch/microblaze/include/asm/processor.h | 2 --
arch/microblaze/kernel/process.c | 12 ------------
arch/mn10300/kernel/smp.c | 5 -----
7 files changed, 3 insertions(+), 60 deletions(-)

Index: linux-2.6/arch/arm/kernel/process.c
===================================================================
--- linux-2.6.orig/arch/arm/kernel/process.c
+++ linux-2.6/arch/arm/kernel/process.c
@@ -64,16 +64,12 @@ void disable_hlt(void)
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)
{
hlt_counter = 1;
Index: linux-2.6/arch/cris/arch-v32/kernel/process.c
===================================================================
--- linux-2.6.orig/arch/cris/arch-v32/kernel/process.c
+++ linux-2.6/arch/cris/arch-v32/kernel/process.c
@@ -20,16 +20,14 @@

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();
}
Index: linux-2.6/arch/cris/include/asm/processor.h
===================================================================
--- linux-2.6.orig/arch/cris/include/asm/processor.h
+++ linux-2.6/arch/cris/include/asm/processor.h
@@ -65,13 +65,6 @@ static inline void release_thread(struct

#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 */
Index: linux-2.6/arch/cris/kernel/process.c
===================================================================
--- linux-2.6.orig/arch/cris/kernel/process.c
+++ linux-2.6/arch/cris/kernel/process.c
@@ -29,31 +29,6 @@

//#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);
Index: linux-2.6/arch/microblaze/include/asm/processor.h
===================================================================
--- linux-2.6.orig/arch/microblaze/include/asm/processor.h
+++ linux-2.6/arch/microblaze/include/asm/processor.h
@@ -160,8 +160,6 @@ unsigned long get_wchan(struct task_stru
# 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
Index: linux-2.6/arch/microblaze/kernel/process.c
===================================================================
--- linux-2.6.orig/arch/microblaze/kernel/process.c
+++ linux-2.6/arch/microblaze/kernel/process.c
@@ -46,18 +46,6 @@ EXPORT_SYMBOL(pm_power_off);

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;
Index: linux-2.6/arch/mn10300/kernel/smp.c
===================================================================
--- linux-2.6.orig/arch/mn10300/kernel/smp.c
+++ linux-2.6/arch/mn10300/kernel/smp.c
@@ -935,8 +935,6 @@ int __cpu_up(unsigned int cpu, struct ta
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 */
@@ -1003,9 +1001,6 @@ int __cpu_disable(void)
void __cpu_die(unsigned int cpu)
{
run_sleep_cpu(cpu);
-
- if (num_online_cpus() == 1)
- enable_hlt();
}

#ifdef CONFIG_MN10300_CACHE_ENABLED