[PATCH] remove timer debug field

Remove timer_list.magic and associated debugging code.

I originally added this when a spinlock was added to timer_list - this meant
that an all-zeroes timer became illegal and init_timer() was required.

That spinlock isn't even there any more, although timer.base must now be
initialised.

I'll keep this debugging code in -mm.
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/s390/kernel/vtime.c

@@ -24,7 +24,6 @@
 #include <asm/s390_ext.h>
 #include <asm/timer.h>
 
-#define VTIMER_MAGIC (TIMER_MAGIC + 1)
 static ext_int_info_t ext_int_info_timer;
 DEFINE_PER_CPU(struct vtimer_queue, virt_cpu_timer);
 
@@ -277,20 +276,12 @@ static void do_cpu_timer_interrupt(struct pt_regs *regs, __u16 error_code)
 
 void init_virt_timer(struct vtimer_list *timer)
 {
-	timer->magic = VTIMER_MAGIC;
 	timer->function = NULL;
 	INIT_LIST_HEAD(&timer->entry);
 	spin_lock_init(&timer->lock);
 }
 EXPORT_SYMBOL(init_virt_timer);
 
-static inline int check_vtimer(struct vtimer_list *timer)
-{
-	if (timer->magic != VTIMER_MAGIC)
-		return -EINVAL;
-	return 0;
-}
-
 static inline int vtimer_pending(struct vtimer_list *timer)
 {
 	return (!list_empty(&timer->entry));
@@ -346,7 +337,7 @@ static void internal_add_vtimer(struct vtimer_list *timer)
 
 static inline int prepare_vtimer(struct vtimer_list *timer)
 {
-	if (check_vtimer(timer) || !timer->function) {
+	if (!timer->function) {
 		printk("add_virt_timer: uninitialized timer\n");
 		return -EINVAL;
 	}
@@ -414,7 +405,7 @@ int mod_virt_timer(struct vtimer_list *timer, __u64 expires)
 	unsigned long flags;
 	int cpu;
 
-	if (check_vtimer(timer) || !timer->function) {
+	if (!timer->function) {
 		printk("mod_virt_timer: uninitialized timer\n");
 		return	-EINVAL;
 	}
@@ -481,11 +472,6 @@ int del_virt_timer(struct vtimer_list *timer)
 	unsigned long flags;
 	struct vtimer_queue *vt_list;
 
-	if (check_vtimer(timer)) {
-		printk("del_virt_timer: timer not initialized\n");
-		return -EINVAL;
-	}
-
 	/* check if timer is pending */
 	if (!vtimer_pending(timer))
 		return 0;

include/linux/timer.h

@@ -12,16 +12,12 @@ struct timer_list {
 	struct list_head entry;
 	unsigned long expires;
 
-	unsigned long magic;
-
 	void (*function)(unsigned long);
 	unsigned long data;
 
 	struct timer_base_s *base;
 };
 
-#define TIMER_MAGIC	0x4b87ad6e
-
 extern struct timer_base_s __init_timer_base;
 
 #define TIMER_INITIALIZER(_function, _expires, _data) {		\
@@ -29,7 +25,6 @@ extern struct timer_base_s __init_timer_base;
 		.expires = (_expires),				\
 		.data = (_data),				\
 		.base = &__init_timer_base,			\
-		.magic = TIMER_MAGIC,				\
 	}
 
 #define DEFINE_TIMER(_name, _function, _expires, _data)		\

kernel/timer.c

@@ -91,30 +91,6 @@ static inline void set_running_timer(tvec_base_t *base,
 #endif
 }
 
-static void check_timer_failed(struct timer_list *timer)
-{
-	static int whine_count;
-	if (whine_count < 16) {
-		whine_count++;
-		printk("Uninitialised timer!\n");
-		printk("This is just a warning.  Your computer is OK\n");
-		printk("function=0x%p, data=0x%lx\n",
-			timer->function, timer->data);
-		dump_stack();
-	}
-	/*
-	 * Now fix it up
-	 */
-	timer->magic = TIMER_MAGIC;
-}
-
-static inline void check_timer(struct timer_list *timer)
-{
-	if (timer->magic != TIMER_MAGIC)
-		check_timer_failed(timer);
-}
-
-
 static void internal_add_timer(tvec_base_t *base, struct timer_list *timer)
 {
 	unsigned long expires = timer->expires;
@@ -177,7 +153,6 @@ void fastcall init_timer(struct timer_list *timer)
 {
 	timer->entry.next = NULL;
 	timer->base = &per_cpu(tvec_bases, raw_smp_processor_id()).t_base;
-	timer->magic = TIMER_MAGIC;
 }
 EXPORT_SYMBOL(init_timer);
 
@@ -230,7 +205,6 @@ int __mod_timer(struct timer_list *timer, unsigned long expires)
 	int ret = 0;
 
 	BUG_ON(!timer->function);
-	check_timer(timer);
 
 	base = lock_timer_base(timer, &flags);
 
@@ -283,9 +257,6 @@ void add_timer_on(struct timer_list *timer, int cpu)
   	unsigned long flags;
 
   	BUG_ON(timer_pending(timer) || !timer->function);
-
-	check_timer(timer);
-
 	spin_lock_irqsave(&base->t_base.lock, flags);
 	timer->base = &base->t_base;
 	internal_add_timer(base, timer);
@@ -316,8 +287,6 @@ int mod_timer(struct timer_list *timer, unsigned long expires)
 {
 	BUG_ON(!timer->function);
 
-	check_timer(timer);
-
 	/*
 	 * This is a common optimization triggered by the
 	 * networking code - if the timer is re-modified
@@ -348,8 +317,6 @@ int del_timer(struct timer_list *timer)
 	unsigned long flags;
 	int ret = 0;
 
-	check_timer(timer);
-
 	if (timer_pending(timer)) {
 		base = lock_timer_base(timer, &flags);
 		if (timer_pending(timer)) {
@@ -412,8 +379,6 @@ out:
  */
 int del_timer_sync(struct timer_list *timer)
 {
-	check_timer(timer);
-
 	for (;;) {
 		int ret = try_to_del_timer_sync(timer);
 		if (ret >= 0)