x86, numa: Fix numa_emulation code with memory-less node0
authorYinghai Lu <yinghai@kernel.org>
Wed, 2 Mar 2011 23:14:58 +0000 (15:14 -0800)
committerIngo Molnar <mingo@elte.hu>
Fri, 4 Mar 2011 14:20:19 +0000 (15:20 +0100)
commit3b28cf32cc32594710590685ee478f697ed4f328
treebd6e1e60481a2fe2520825fce80e265558d244f2
parent6670e9cdaf554290e26121aa72f0118f2fac52e5
x86, numa: Fix numa_emulation code with memory-less node0

This crash happens on a system that does not have RAM on node0.

When numa_emulation is compiled in, and:

 1. we boot the system without numa=fake...
 2. or we boot the system with numa=fake=128 to make emulation fail

we will get:

[    0.076025] ------------[ cut here ]------------
[    0.080004] kernel BUG at arch/x86/mm/numa_64.c:788!
[    0.080004] invalid opcode: 0000 [#1] SMP
[...]

need to use early_cpu_to_node() directly, because cpu_to_apicid
and apicid_to_node will return node0 that is not onlined.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Acked-by: Tejun Heo <tj@kernel.org>
Cc: David Rientjes <rientjes@google.com>
LKML-Reference: <4D6ECF72.5010308@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
arch/x86/mm/numa_64.c