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uml: eliminate interrupts in the idle loop

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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>
This commit is contained in:
Jeff Dike
2007-10-16 01:27:26 -07:00
committed by Linus Torvalds
parent d2753a6d19
commit b160fb6309
4 changed files with 18 additions and 53 deletions
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3
arch/um/os-Linux/signal.c
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@@ -120,7 +120,6 @@ void (*handlers[_NSIG])(int sig, struct sigcontext *sc);
void handle_signal(int sig, struct sigcontext *sc)
{
unsigned long pending = 1UL << sig;
int timer = switch_timers(0);
do {
int nested, bail;
@@ -157,8 +156,6 @@ void handle_signal(int sig, struct sigcontext *sc)
if (!nested)
pending = from_irq_stack(nested);
} while (pending);
switch_timers(timer);
}
extern void hard_handler(int sig);