2.6.11-rc1 causes the powermac ADB driver, which controls
the keyboard and mouse on pre-USB powermacs, to hang during
bootup. The last kernel message seen is:
adb: starting probe task...
and then the machine hangs hard. 2.6.10 did not have this problem.
The problem appears to be caused by the local_irq_disable()
added to init/main.c:rest_init() in 2.6.10-bk12:
--- a/init/main.c 2005-01-11 20:02:35 -08:00
+++ b/init/main.c 2005-01-11 20:02:35 -08:00
@@ -445,6 +373,12 @@
{
kernel_thread(init, NULL, CLONE_FS | CLONE_SIGHAND);
numa_default_policy();
+ /*
+ * Re-enable preemption but disable interrupts to make sure
+ * we dont get preempted until we schedule() in cpu_idle().
+ */
+ local_irq_disable();
+ preempt_enable_no_resched();
unlock_kernel();
cpu_idle();
}
Commenting out that local_irq_disable() makes the machine
boot Ok again.
The machine is a Beige G3, SMP=n, PREEMPT=n, ADB=y, ADB_CUDA=y.
/Mikael