[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>

3 files changed, 2 insertions, 56 deletions

diff --git a/arch/s390/kernel/vtime.c b/arch/s390/kernel/vtime.c
index fa0726507b3d..22a895ecb7a4 100644
--- a/arch/s390/kernel/vtime.c
+++ b/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;
diff --git a/include/linux/timer.h b/include/linux/timer.h
index ddd5bbe1fc8e..b1dc583bb4d4 100644
--- a/include/linux/timer.h
+++ b/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)         \
diff --git a/kernel/timer.c b/kernel/timer.c
index cc18857601e2..562d53eabb46 100644
--- a/kernel/timer.c
+++ b/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)