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authorJeff Dike <jdike@addtoit.com>2007-10-16 01:27:26 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-16 09:43:08 -0700
commitb160fb6309dc907cbd8849e549d83badb86dd35b (patch)
treeb4a69cc1b96b4aa83aa971c35af5a23e5e07b56f /arch/um/include/os.h
parentd2753a6d199791a6abc75d9f657e3457fe61705f (diff)
uml: eliminate interrupts in the idle loop
Now, the idle loop now longer needs SIGALRM firing - it can just sleep for the requisite amount of time and fake a timer interrupt when it finishes. Any use of ITIMER_REAL now goes away. disable_timer only turns off ITIMER_VIRTUAL. switch_timers is no longer needed, so it, and all calls, goes away. disable_timer now returns the amount of time remaining on the timer. default_idle uses this to tell idle_sleep how long to sleep. idle_sleep will call alarm_handler if nanosleep returns 0, which is the case if it didn't return early due to an interrupt. Otherwise, it just returns. Signed-off-by: Jeff Dike <jdike@linux.intel.com> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/um/include/os.h')
-rw-r--r--arch/um/include/os.h5
1 files changed, 2 insertions, 3 deletions
diff --git a/arch/um/include/os.h b/arch/um/include/os.h
index e4f2fe11ba50..91642e4137d7 100644
--- a/arch/um/include/os.h
+++ b/arch/um/include/os.h
@@ -251,11 +251,10 @@ extern void os_dump_core(void);
/* time.c */
#define BILLION (1000 * 1000 * 1000)
-extern int switch_timers(int to_real);
-extern void idle_sleep(int secs);
+extern void idle_sleep(unsigned long long nsecs);
extern int set_interval(void);
extern int timer_one_shot(int ticks);
-extern void disable_timer(void);
+extern unsigned long long disable_timer(void);
extern void uml_idle_timer(void);
extern unsigned long long os_nsecs(void);