interrupt is enabled before it should be when kernel is booted

[Zhang, Yanmin]

There is a minor problem in function start_kernel. start_kernel will
enable interrupt after calling profile_init. However, before that,
function time_init on IA64 platform could enable interrupt. See this
call sequence:
start_kernel->time_init->ia64_init_itm->register_time_interpolator->writ
e_seqlock_irq. 
The attachment is a patch to fix it in generic source codes against
2.6.8.

Signed-off-by:	Zhang Yanmin <yanmin.zhang@xxxxxxxxx>
Signed-off-by:	Yao Jun	<junx.yao@xxxxxxxxx>


diff -Nraup linux-2.6.8/kernel/timer.c linux-2.6.8_fix/kernel/timer.c
--- linux-2.6.8/kernel/timer.c	2004-08-16 07:58:21.000000000 +0800
+++ linux-2.6.8_fix/kernel/timer.c	2004-08-17 17:03:38.364035163
+0800
@@ -1447,11 +1447,13 @@ is_better_time_interpolator(struct time_
 void
 register_time_interpolator(struct time_interpolator *ti)
 {
+	unsigned long	flags;
+
 	spin_lock(&time_interpolator_lock);
-	write_seqlock_irq(&xtime_lock);
+	write_seqlock_irqsave(&xtime_lock, flags);
 	if (is_better_time_interpolator(ti))
 		time_interpolator = ti;
-	write_sequnlock_irq(&xtime_lock);
+	write_sequnlock_irqrestore(&xtime_lock, flags);
 
 	ti->next = time_interpolator_list;
 	time_interpolator_list = ti;
@@ -1462,6 +1464,7 @@ void
 unregister_time_interpolator(struct time_interpolator *ti)
 {
 	struct time_interpolator *curr, **prev;
+	unsigned long	flags;
 
 	spin_lock(&time_interpolator_lock);
 	prev = &time_interpolator_list;
@@ -1473,7 +1476,7 @@ unregister_time_interpolator(struct time
 		prev = &curr->next;
 	}
 
-	write_seqlock_irq(&xtime_lock);
+	write_seqlock_irqsave(&xtime_lock, flags);
 	if (ti == time_interpolator) {
 		/* we lost the best time-interpolator: */
 		time_interpolator = NULL;
@@ -1482,7 +1485,7 @@ unregister_time_interpolator(struct time
 			if (is_better_time_interpolator(curr))
 				time_interpolator = curr;
 	}
-	write_sequnlock_irq(&xtime_lock);
+	write_sequnlock_irqrestore(&xtime_lock, flags);
 	spin_unlock(&time_interpolator_lock);
 }
 #endif /* CONFIG_TIME_INTERPOLATION */



 <<time_init_enable_interrupt.patch.diff>>

Attachment: time_init_enable_interrupt.patch.diff
Description: time_init_enable_interrupt.patch.diff