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    SubjectRe: 2.6.21-rc5: maxcpus=1 crash in cpufreq: kernel BUG at drivers/cpufreq/cpufreq.c:82!
    On Mon, Mar 26, 2007 at 11:12:02AM -0700, Venki Pallipadi wrote:
    >
    > >Calling initcall 0xffffffff8021e003: powernowk8_init+0x0/0x88()
    > >powernow-k8: Found 1 AMD Athlon(tm) 64 X2 Dual Core Processor 3800+
    > >processors (version 2.00.00)
    > >powernow-k8: BIOS error - no PSB or ACPI _PSS objects
    > >------------[ cut here ]------------
    > >kernel BUG at drivers/cpufreq/cpufreq.c:82!
    > >invalid opcode: 0000 [1] PREEMPT SMP
    > >CPU 0
    > >Modules linked in:
    > >Pid: 1, comm: swapper Not tainted 2.6.21-rc5 #14
    > >RIP: 0010:[<ffffffff804a0edd>] [<ffffffff804a0edd>]
    > >lock_policy_rwsem_write+0x2b/0x7f
    > >RSP: 0000:ffff81003ff31de0 EFLAGS: 00010246
    > >RAX: 00000000ffffffff RBX: ffffffff80aa46a8 RCX: 0000000000000000
    > >RDX: ffffffff80741080 RSI: 0000000000000202 RDI: 0000000000000001
    > >RBP: ffff81003ff31e00 R08: ffff81003ff30000 R09: ffff810002dfdab0
    > >R10: ffff810002dfdab0 R11: ffff810002dfdab0 R12: 0000000000000001
    > >R13: ffffffff806cc2c0 R14: ffffffff80a37920 R15: 0000000000000000
    > >FS: 0000000000000000(0000) GS:ffffffff80741000(0000) knlGS:
    > >0000000000000000
    > >CS: 0010 DS: 0018 ES: 0018 CR0: 000000008005003b
    > >CR2: 0000000000f06f53 CR3: 0000000000201000 CR4: 00000000000006e0
    > >Process swapper (pid: 1, threadinfo ffff81003ff30000, task
    > >ffff81003ff2a790)
    > >Stack: ffffffff806cc2c0 ffffffff80aa46a8 ffffffff80aa46a8
    > >ffffffff806cc2c0
    > > ffff81003ff31e20 ffffffff804a1538 ffff810002dfdab0 ffffffff806f6a40
    > > ffff81003ff31e50 ffffffff803dffdf 00000000ffffffed 00000000ffffffed
    > >Call Trace:
    > > [<ffffffff804a1538>] cpufreq_remove_dev+0x11/0x26
    > > [<ffffffff803dffdf>] sysdev_driver_unregister+0x52/0x98
    > > [<ffffffff804a0d3b>] cpufreq_register_driver+0x12d/0x191
    > > [<ffffffff8021e082>] powernowk8_init+0x7f/0x88
    > > [<ffffffff80a1099e>] init+0x1a8/0x2a9
    > > [<ffffffff8023294e>] schedule_tail+0x36/0x9a
    > > [<ffffffff8020ab98>] child_rip+0xa/0x12
    > > [<ffffffff80a107f6>] init+0x0/0x2a9
    > > [<ffffffff8020ab8e>] child_rip+0x0/0x12
    > >
    > >
    > >Code: 0f 0b eb fe 4c 63 e8 48 c7 c3 a0 c1 a6 80 4a 8b 04 ed c0 7a
    > >RIP [<ffffffff804a0edd>] lock_policy_rwsem_write+0x2b/0x7f
    > > RSP <ffff81003ff31de0>
    > >Kernel panic - not syncing: Attempted to kill init!
    > >
    >

    Ingo,

    Does the patch below help?

    Thanks,
    Venki


    Patch to resolve maxcpus=1 trigerring BUG() as reported by Ingo here

    lkml subject:
    "2.6.21-rc5: maxcpus=1 crash in cpufreq: kernel BUG at drivers/cpufreq/cpufreq.c:82!"

    This check added to remove_dev is symmetric to one in add_dev and handles
    callbacks for offline cpus cleanly.

    Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>

    Index: new/drivers/cpufreq/cpufreq.c
    ===================================================================
    --- new.orig/drivers/cpufreq/cpufreq.c 2007-03-22 07:43:37.000000000 -0800
    +++ new/drivers/cpufreq/cpufreq.c 2007-03-26 10:07:06.000000000 -0800
    @@ -1015,6 +1015,10 @@
    {
    unsigned int cpu = sys_dev->id;
    int retval;
    +
    + if (cpu_is_offline(cpu))
    + return 0;
    +
    if (unlikely(lock_policy_rwsem_write(cpu)))
    BUG();

    -
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