[PATCH][2.6] Quiesce after changing ACPI idle thread

[Zwane Mwaikambo]

This patch addresses the following bugzilla bug;

http://bugzilla.kernel.org/show_bug.cgi?id=1716

When unloading the processor module we modify the currently used idle
thread (pm_idle), this causes an oops due to the idle thread text being
unloaded.

Index: linux-2.6.8-rc1-mm1/drivers/acpi/processor.c
===================================================================
RCS file: /home/cvsroot/linux-2.6.8-rc1-mm1/drivers/acpi/processor.c,v
retrieving revision 1.1.1.1
diff -u -p -B -r1.1.1.1 processor.c
--- linux-2.6.8-rc1-mm1/drivers/acpi/processor.c	14 Jul 2004 04:56:25 -0000	1.1.1.1
+++ linux-2.6.8-rc1-mm1/drivers/acpi/processor.c	20 Jul 2004 15:31:46 -0000
@@ -2372,8 +2372,10 @@ acpi_processor_remove (
 	pr = (struct acpi_processor *) acpi_driver_data(device);

 	/* Unregister the idle handler when processor #0 is removed. */
-	if (pr->id == 0)
+	if (pr->id == 0) {
 		pm_idle = pm_idle_save;
+		synchronize_kernel();
+	}

 	status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,
 		acpi_processor_notify);
-
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