Re: [tip:smp/hotplug] idle: Implement generic idle function

[Tony Luck]

Built next-20130415 and got this on ia64 early in boot:

WARNING: at kernel/cpu/idle.c:94 cpu_idle_loop+0x360/0x380()
Hardware name: server rx2620
Modules linked in:

Call Trace:
 [<a000000100014ac0>] show_stack+0x80/0xa0
                                sp=a000000101287c50 bsp=a000000101280e48
 [<a000000100dabd40>] dump_stack+0x30/0x50
                                sp=a000000101287e20 bsp=a000000101280e30
 [<a000000100073e40>] warn_slowpath_common+0xc0/0x100
                                sp=a000000101287e20 bsp=a000000101280de8
 [<a000000100073ec0>] warn_slowpath_null+0x40/0x60
                                sp=a000000101287e20 bsp=a000000101280dc0
 [<a0000001000fa7a0>] cpu_idle_loop+0x360/0x380
                                sp=a000000101287e20 bsp=a000000101280d80
 [<a0000001000fa800>] cpu_startup_entry+0x40/0x60
                                sp=a000000101287e20 bsp=a000000101280d68
 [<a000000100d9f460>] rest_init+0x100/0x120
                                sp=a000000101287e20 bsp=a000000101280d50
 [<a00000010114d3b0>] start_kernel+0x770/0x890
                                sp=a000000101287e20 bsp=a000000101280cd0
 [<a000000100d9f320>] start_ap+0x760/0x780
                                sp=a000000101287e30 bsp=a000000101280bc0
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