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authorPeter Zijlstra <peterz@infradead.org>2008-04-25 17:39:01 +0200
committerIngo Molnar <mingo@elte.hu>2008-04-27 00:01:45 +0200
commit7f424a8b08c26dc14ac5c17164014539ac9a5c65 (patch)
treef1f7268ce5215fe4909cb801313a8997d52d1e1e /drivers/acpi
parentc3bf9bc243092c53946fd6d8ebd6dc2f4e572d48 (diff)
fix idle (arch, acpi and apm) and lockdep
OK, so 25-mm1 gave a lockdep error which made me look into this. The first thing that I noticed was the horrible mess; the second thing I saw was hacks like: 71e93d15612c61c2e26a169567becf088e71b8ff The problem is that arch idle routines are somewhat inconsitent with their IRQ state handling and instead of fixing _that_, we go paper over the problem. So the thing I've tried to do is set a standard for idle routines and fix them all up to adhere to that. So the rules are: idle routines are entered with IRQs disabled idle routines will exit with IRQs enabled Nearly all already did this in one form or another. Merge the 32 and 64 bit bits so they no longer have different bugs. As for the actual lockdep warning; __sti_mwait() did a plainly un-annotated irq-enable. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Tested-by: Bob Copeland <me@bobcopeland.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'drivers/acpi')
-rw-r--r--drivers/acpi/processor_idle.c19
1 files changed, 9 insertions, 10 deletions
diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index 788da9781f80..0d90ff5fd117 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -418,13 +418,12 @@ static void acpi_processor_idle(void)
cx = pr->power.state;
if (!cx || acpi_idle_suspend) {
- if (pm_idle_save)
- pm_idle_save();
- else
+ if (pm_idle_save) {
+ pm_idle_save(); /* enables IRQs */
+ } else {
acpi_safe_halt();
-
- if (irqs_disabled())
local_irq_enable();
+ }
return;
}
@@ -520,10 +519,12 @@ static void acpi_processor_idle(void)
* Use the appropriate idle routine, the one that would
* be used without acpi C-states.
*/
- if (pm_idle_save)
- pm_idle_save();
- else
+ if (pm_idle_save) {
+ pm_idle_save(); /* enables IRQs */
+ } else {
acpi_safe_halt();
+ local_irq_enable();
+ }
/*
* TBD: Can't get time duration while in C1, as resumes
@@ -534,8 +535,6 @@ static void acpi_processor_idle(void)
* skew otherwise.
*/
sleep_ticks = 0xFFFFFFFF;
- if (irqs_disabled())
- local_irq_enable();
break;