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SubjectRe: linux-next: Tree for June 13: IO APIC breakage on HP nx6325
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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