Messages in this thread Patch in this message | | | Date | Tue, 17 Jun 2008 09:12:03 +0200 (CEST) | From | Thomas Gleixner <> | Subject | Re: linux-next: Tree for June 13: IO APIC breakage on HP nx6325 |
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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?
Yeah, my bad. Fix below.
Thanks, tglx
-------------------> Subject: x86: c1e_idle, run BROADCAST_FORCE notify with irqs enabled From: Thomas Gleixner <tglx@linutronix.de> Date: Tue, 17 Jun 2008 09:07:53 +0200
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.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de> --- diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c index 57fa86d..1450e0f 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(); }
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