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    SubjectRCU init call bootmem allocation after slub us ready.
    From
    [    0.000000] SLUB: Genslabs=15, HWalign=64, Order=0-3, MinObjects=0,
    CPUs=160, Nodes=8
    [ 0.000000] Hierarchical RCU implementation.
    [ 0.000000] RCU restricting CPUs from NR_CPUS=4096 to nr_cpu_ids=160.
    [ 0.000000] ------------[ cut here ]------------
    [ 0.000000] WARNING: at mm/nobootmem.c:234
    ___alloc_bootmem_nopanic+0x3a/0x7d()
    [ 0.000000] Modules linked in:
    [ 0.000000] CPU: 0 PID: 0 Comm: swapper/0 Not tainted
    3.9.0-yh-10495-gfc7ffbc-dirty #1543
    [ 0.000000] Hardware name: Oracle Corporation Sun Fire X4800 M2 /
    , BIOS 15013200 04/19/2012
    [ 0.000000] 0000000000000009 ffffffff82a01e58 ffffffff8209dc61
    ffffffff82a01e98
    [ 0.000000] ffffffff8108a9d0 0000000000000000 0000000000000000
    0000000000000200
    [ 0.000000] ffffffffffffffff 0000000000000040 0000000000000000
    ffffffff82a01ea8
    [ 0.000000] Call Trace:
    [ 0.000000] [<ffffffff8209dc61>] dump_stack+0x19/0x1b
    [ 0.000000] [<ffffffff8108a9d0>] warn_slowpath_common+0x70/0xa0
    [ 0.000000] [<ffffffff8108aa1a>] warn_slowpath_null+0x1a/0x20
    [ 0.000000] [<ffffffff82dd54cd>] ___alloc_bootmem_nopanic+0x3a/0x7d
    [ 0.000000] [<ffffffff82dd5695>] __alloc_bootmem+0x12/0x38
    [ 0.000000] [<ffffffff82de976a>] alloc_bootmem_cpumask_var+0x1a/0x21
    [ 0.000000] [<ffffffff82dce4da>] rcu_init+0x66/0x283
    [ 0.000000] [<ffffffff82dd15ed>] ? perf_event_init+0x136/0x15f
    [ 0.000000] [<ffffffff82dabf95>] start_kernel+0x24a/0x423
    [ 0.000000] [<ffffffff82dababe>] ? repair_env_string+0x5e/0x5e
    [ 0.000000] [<ffffffff820936b6>] ? __memblock_reserve+0x81/0x89
    [ 0.000000] [<ffffffff82dab5a8>] x86_64_start_reservations+0x2f/0x31
    [ 0.000000] [<ffffffff82dab79e>] x86_64_start_kernel+0x1f4/0x1fc
    [ 0.000000] ---[ end trace 53ae8bb075006d8f ]---


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