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| author | Thomas Gleixner <tglx@linutronix.de> | 2008-06-17 09:12:03 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-07-08 07:47:37 +0200 |
| commit | 0beefa208bb3a9e581a60125703409ebe6f7fa53 (patch) | |
| tree | 0bfdec0cfd70031a70704ced8386c10c05fc034c /arch/x86/kernel | |
| parent | aa276e1cafb3ce9d01d1e837bcd67e92616013ac (diff) | |
| download | op-kernel-dev-0beefa208bb3a9e581a60125703409ebe6f7fa53.zip op-kernel-dev-0beefa208bb3a9e581a60125703409ebe6f7fa53.tar.gz | |
x86: add C1E aware idle function, fix
On Tue, 17 Jun 2008, Rafael J. Wysocki wrote:
>
> BTW, with the C1E patches reverted I don't get the
> WARNING: at /home/rafael/src/linux-next/kernel/smp.c:215 smp_call_function_single+0x3d/0xa2
> in the log. Thomas?
The BROADCAST_FORCE notification uses smp_function_call and therefor
must be run with interrupts enabled.
While at it, add a comment for the BROADCAST_EXIT notifier as well.
Reported-and-bisected-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/kernel')
| -rw-r--r-- | arch/x86/kernel/process.c | 20 |
1 files changed, 16 insertions, 4 deletions
diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c index 68ad353..4061d63 100644 --- a/arch/x86/kernel/process.c +++ b/arch/x86/kernel/process.c @@ -267,17 +267,29 @@ static void c1e_idle(void) if (!cpu_isset(cpu, c1e_mask)) { cpu_set(cpu, c1e_mask); - /* Force broadcast so ACPI can not interfere */ + /* + * Force broadcast so ACPI can not interfere. Needs + * to run with interrupts enabled as it uses + * smp_function_call. + */ + local_irq_enable(); clockevents_notify(CLOCK_EVT_NOTIFY_BROADCAST_FORCE, &cpu); printk(KERN_INFO "Switch to broadcast mode on CPU%d\n", cpu); + local_irq_disable(); } clockevents_notify(CLOCK_EVT_NOTIFY_BROADCAST_ENTER, &cpu); + default_idle(); - local_irq_disable(); - clockevents_notify(CLOCK_EVT_NOTIFY_BROADCAST_EXIT, &cpu); - local_irq_enable(); + + /* + * The switch back from broadcast mode needs to be + * called with interrupts disabled. + */ + local_irq_disable(); + clockevents_notify(CLOCK_EVT_NOTIFY_BROADCAST_EXIT, &cpu); + local_irq_enable(); } else default_idle(); } |
