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    Subject2.6.23-rc4: maxcpus still broken
    Every time I try to boot with maxcpus=1 it dies show_stat():

    for_each_possible_cpu(i) {
    int j;

    HERE ==> user = cputime64_add(user, kstat_cpu(i).cpustat.user);


    $ grep ACPI .config
    $ grep APIC .config
    CONFIG_X86_GOOD_APIC=y
    CONFIG_X86_IO_APIC=y
    CONFIG_X86_LOCAL_APIC=y


    Unable to handle kernel paging request at ffffffff804ed6e0 RIP:
    [<ffffffff802a5cd0>] show_stat+0xc8/0x3a6
    PGD 203067 PUD 207063 PMD 17fc27163 PTE 4ed000
    Oops: 0000 [1] SMP
    CPU 0
    Modules linked in:
    Pid: 380, comm: udevd Not tainted 2.6.23-rc4-utrace #1
    RIP: 0010:[<ffffffff802a5cd0>] [<ffffffff802a5cd0>] show_stat+0xc8/0x3a6
    RSP: 0018:ffff81017ed77d88 EFLAGS: 00010246
    RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001
    RDX: ffffffff804ed6e0 RSI: 0000000000000000 RDI: 0000000000000001
    RBP: 0000000000000022 R08: 0000000000000000 R09: 0000000000000000
    R10: ffff81017fd52080 R11: 0000000000000246 R12: 0000000000000000
    R13: 000000000000011d R14: 0000000000000000 R15: 00007fff33944ef0
    FS: 00002b32774b26d0(0000) GS:ffffffff804aa000(0000) knlGS:0000000000000000
    CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
    CR2: ffffffff804ed6e0 CR3: 000000017f38f000 CR4: 00000000000006a0
    DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
    DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
    Process udevd (pid: 380, threadinfo ffff81017ed76000, task ffff81017fd52080)
    Stack: ffff81017fd52080 ffffffff802418ac ffff81017fd52810 ffff81017fd52080
    0000000000000003 ffffffff80241d15 ffff81017fd52810 ffff81017f79d668
    0000000046d3d6bf ffffffff80241e73 ffff81017f79d698 ffff81017fd52080
    Call Trace:
    [<ffffffff802418ac>] check_usage_backwards+0x1e/0x43
    [<ffffffff80241d15>] mark_lock+0x367/0x47c
    [<ffffffff80241e73>] mark_held_locks+0x49/0x67
    [<ffffffff803b1cf8>] __mutex_lock_slowpath+0x254/0x26a
    [<ffffffff803b1d03>] __mutex_lock_slowpath+0x25f/0x26a
    [<ffffffff8028a216>] seq_read+0x10b/0x2a1
    [<ffffffff8028a10b>] seq_read+0x0/0x2a1
    [<ffffffff802a0590>] proc_reg_read+0x80/0x9a
    [<ffffffff80272a9b>] vfs_read+0x91/0xb5
    [<ffffffff80272dd3>] sys_read+0x45/0x6e
    [<ffffffff8020b5ae>] system_call+0x7e/0x83


    Code: 48 8b 0c 02 48 01 4c 24 68 48 8b 4c 02 08 48 01 4c 24 70 48
    RIP [<ffffffff802a5cd0>] show_stat+0xc8/0x3a6
    RSP <ffff81017ed77d88>
    CR2: ffffffff804ed6e0
    awk used greatest stack depth: 4272 bytes left

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