rcu_init allocation failure trace on bootup

[Dave Jones]

[    0.000000]  RCU debugfs-based tracing is enabled.
[    0.000000]  RCU lockdep checking is enabled.
[    0.000000] ------------[ cut here ]------------
[    0.000000] WARNING: at mm/nobootmem.c:215 ___alloc_bootmem_nopanic+0x3a/0x7d()
[    0.000000] Modules linked in:
[    0.000000] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 3.9.0+ #128
[    0.000000] Hardware name:                  /D975XBX, BIOS BX97510J.86A.1209.2006.0601.1340 06/01/2006
[    0.000000]  ffffffff819f4246 ffffffff81c01e68 ffffffff816a0db2 ffffffff81c01ea8
[    0.000000]  ffffffff8104b1a0 ffffffff819e1078 0000000000000000 0000000000000008
[    0.000000]  ffffffffffffffff 0000000000000040 0000000000000000 ffffffff81c01eb8
[    0.000000] Call Trace:
[    0.000000]  [<ffffffff816a0db2>] dump_stack+0x19/0x1b
[    0.000000]  [<ffffffff8104b1a0>] warn_slowpath_common+0x70/0xa0
[    0.000000]  [<ffffffff8104b1ea>] warn_slowpath_null+0x1a/0x20
[    0.000000]  [<ffffffff81ef8914>] ___alloc_bootmem_nopanic+0x3a/0x7d
[    0.000000]  [<ffffffff81ef8b87>] __alloc_bootmem+0x13/0x39
[    0.000000]  [<ffffffff81f090ad>] alloc_bootmem_cpumask_var+0x1a/0x21
[    0.000000]  [<ffffffff81ef1f5a>] rcu_init+0x7f/0x261
[    0.000000]  [<ffffffff81ef4acb>] ? perf_event_init+0x178/0x181
[    0.000000]  [<ffffffff81ed6c79>] start_kernel+0x232/0x3d3
[    0.000000]  [<ffffffff81ed6846>] ? repair_env_string+0x5e/0x5e
[    0.000000]  [<ffffffff81ed6577>] x86_64_start_reservations+0x2a/0x2c
[    0.000000]  [<ffffffff81ed6646>] x86_64_start_kernel+0xcd/0xd1
[    0.000000] ---[ end trace 0acfc82c197165dd ]---
[    0.000000]  Experimental no-CBs for all CPUs
[    0.000000]  Experimental no-CBs CPUs: 0-1.
[    0.000000] NO_HZ: Full dynticks CPUs: 1.

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