On Thu, 2009-09-24 at 09:53 +0900, Tejun Heo wrote:
> Add PCPU_SETUP_BUG() macro which prints out enough information about
> the parameters.  As the macro still puts separate BUG() for each
> check, it won't lose any information even on the situations where only
> the program counter can be retrieved.

On Thu, 2009-09-24 at 21:49 +0900, Tejun Heo wrote:
> Warn and dump stack when percpu allocation fails.

Thank you Tejun, both patches applied, more information is now visible:

ACPI: INT_SRC_OVR (bus 0 bus_irq 15 global_irq 15 high edge)
Using ACPI (MADT) for SMP configuration information
ACPI: HPET id: 0x10de8201 base: 0xfed00000
SMP: allowing 12 CPUs, 0 hotplug CPUs
Allocating PCI resources starting at b00000000 (gap: b0000000:30000000)
NR_CPUS: 12 nr_cpumask_bits:12 nr_cpu_ids:12 nr_node_ids:2
PERCPU: Embedded 23 pages/cpu @ffff880028200000 s73176 r0 d21032 u262144
PERCPU: failed to initialize, unit_map[cpu] == NR_CPUS
PERCPU: cpu_possible_mask=fff
pcpu-alloc: s73176 r0 d21032 u262144 alloc=1*2097152
pcpu-alloc: [0] 00 01 02 03 04 05 -- -- [1] 06 07 08 09 10 11 -- --
PANIC: early exception 06 rip 10:ffffffff81597feb error 0 cr2 d0fff6
Pid: 0, comm: swapper Not tainted 2.6.31-09194-g0d9df25-dirty #1
Call Trace:
 [<ffffffff81582195>] early_idt_handler+0x55/0x68
 [<ffffffff81597feb>] ? pcpu_setup_first_chunk+0x472/0x769
 [<ffffffff81597feb>] ? pcpu_setup_first_chunk+0x472/0x769
 [<ffffffff815987e8>] pcpu_embed_first_chunk+0x1e2/0x241
 [<ffffffff8158b51d>] ? pcpu_fc_alloc+0x0/0xac
 [<ffffffff8158b4fe>] ? pcpu_fc_free+0x0/0x1f
 [<ffffffff8158b33f>] setup_per_cpu_areas+0x65/0x219
 [<ffffffff815829df>] start_kernel+0x124/0x2c5
 [<ffffffff81582272>] x86_64_start_reservations+0x82/0x86
 [<ffffffff8158235a>] x86_64_start_kernel+0xe4/0xeb
RIP pcpu_setup_first_chunk+0x472/0x769

If you would like the vmlinux image again, let me know.

Regards,
Tony V.