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| author |   Peter Zijlstra <peterz@infradead.org> | 2008-04-25 17:39:01 +0200 |
|---|---|---|
| committer |   Ingo Molnar <mingo@elte.hu> | 2008-04-27 00:01:45 +0200 |
| commit | 7f424a8b08c26dc14ac5c17164014539ac9a5c65 (patch) | |
| tree | f1f7268ce5215fe4909cb801313a8997d52d1e1e /arch/x86/kernel/apm_32.c | |
| parent | Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/x86/linux-2.6-x86-bigbox-bootmem-v3 (diff) | |
| download | linux-dev-7f424a8b08c26dc14ac5c17164014539ac9a5c65.tar.xz linux-dev-7f424a8b08c26dc14ac5c17164014539ac9a5c65.zip | |
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 'arch/x86/kernel/apm_32.c')
| -rw-r--r-- | arch/x86/kernel/apm_32.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/x86/kernel/apm_32.c b/arch/x86/kernel/apm_32.c index f0030a0999c7..e4ea362e8480 100644 --- a/arch/x86/kernel/apm_32.c +++ b/arch/x86/kernel/apm_32.c @@ -904,6 +904,7 @@ recalc: original_pm_idle(); else default_idle(); + local_irq_disable(); jiffies_since_last_check = jiffies - last_jiffies; if (jiffies_since_last_check > idle_period) goto recalc; @@ -911,6 +912,8 @@ recalc: if (apm_idle_done) apm_do_busy(); + + local_irq_enable(); } /** |