Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=4713e22ce81eb8b3353e16435362eb3d0ec95640
Commit: 4713e22ce81eb8b3353e16435362eb3d0ec95640
Parent: 316da3b3fc8efa9a5d2c99e0d449f01ff38c6aba
Author: Thomas Gleixner <[EMAIL PROTECTED]>
AuthorDate: Wed Jan 30 13:30:02 2008 +0100
Committer: Ingo Molnar <[EMAIL PROTECTED]>
CommitDate: Wed Jan 30 13:30:02 2008 +0100
clocksource: add unregister function to disable unusable clocksources
On x86 the PIT might become an unusable clocksource. Add an unregister
function to provide a possibilty to remove the PIT from the list of
available clock sources.
Signed-off-by: Thomas Gleixner <[EMAIL PROTECTED]>
Signed-off-by: Ingo Molnar <[EMAIL PROTECTED]>
---
arch/x86/kernel/i8253.c | 1 +
include/linux/clocksource.h | 1 +
kernel/time/clocksource.c | 15 +++++++++++++++
3 files changed, 17 insertions(+), 0 deletions(-)
diff --git a/arch/x86/kernel/i8253.c b/arch/x86/kernel/i8253.c
index 0f8f354..decc5d2 100644
--- a/arch/x86/kernel/i8253.c
+++ b/arch/x86/kernel/i8253.c
@@ -13,6 +13,7 @@
#include <asm/delay.h>
#include <asm/i8253.h>
#include <asm/io.h>
+#include <asm/hpet.h>
DEFINE_SPINLOCK(i8253_lock);
EXPORT_SYMBOL(i8253_lock);
diff --git a/include/linux/clocksource.h b/include/linux/clocksource.h
index 07b4215..85778a4 100644
--- a/include/linux/clocksource.h
+++ b/include/linux/clocksource.h
@@ -215,6 +215,7 @@ static inline void clocksource_calculate_interval(struct
clocksource *c,
/* used to install a new clocksource */
extern int clocksource_register(struct clocksource*);
+extern void clocksource_unregister(struct clocksource*);
extern struct clocksource* clocksource_get_next(void);
extern void clocksource_change_rating(struct clocksource *cs, int rating);
extern void clocksource_resume(void);
diff --git a/kernel/time/clocksource.c b/kernel/time/clocksource.c
index edd5ef8..6e9259a 100644
--- a/kernel/time/clocksource.c
+++ b/kernel/time/clocksource.c
@@ -337,6 +337,21 @@ void clocksource_change_rating(struct clocksource *cs, int
rating)
spin_unlock_irqrestore(&clocksource_lock, flags);
}
+/**
+ * clocksource_unregister - remove a registered clocksource
+ */
+void clocksource_unregister(struct clocksource *cs)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&clocksource_lock, flags);
+ list_del(&cs->list);
+ if (clocksource_override == cs)
+ clocksource_override = NULL;
+ next_clocksource = select_clocksource();
+ spin_unlock_irqrestore(&clocksource_lock, flags);
+}
+
#ifdef CONFIG_SYSFS
/**
* sysfs_show_current_clocksources - sysfs interface for current clocksource
-
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