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    SubjectPreempt & Xfs Question
    Hi!
    I have a question: Why do I get such debug messages:

    BUG: using smp_processor_id() in preemptible [00000001] code: khelper/892
    caller is _pagebuf_lookup_pages+0x11b/0x362
    [<c03119c7>] smp_processor_id+0xa3/0xb4
    [<c02ef802>] _pagebuf_lookup_pages+0x11b/0x362
    [<c02ef802>] _pagebuf_lookup_pages+0x11b/0x362
    [<c02efe31>] xfs_buf_get_flags+0x106/0x141
    [<c02efeaa>] xfs_buf_read_flags+0x3e/0xae
    [<c02e0fd5>] xfs_trans_read_buf+0x18b/0x389
    [<c02ada32>] xfs_da_do_buf+0x735/0x88c
    [<c0127f46>] run_timer_softirq+0x12d/0x1c7
    [<c02adc1b>] xfs_da_read_buf+0x47/0x4b
    [<c02b1b22>] xfs_dir2_block_lookup_int+0x52/0x1b4
    [<c02b1b22>] xfs_dir2_block_lookup_int+0x52/0x1b4
    [<c011f189>] vprintk+0x133/0x16a
    [<c0101319>] kernel_thread_helper+0x5/0xb
    [<c0130253>] __kernel_text_address+0x28/0x36
    [<c02b1a10>] xfs_dir2_block_lookup+0x2f/0xef
    [<c02b0967>] xfs_dir2_isblock+0x2c/0x74
    [<c02aff4e>] xfs_dir2_lookup+0x176/0x186
    [<c01389d9>] __print_symbol+0x86/0xef
    [<c02e214e>] xfs_dir_lookup_int+0x4c/0x144
    [<c04cf6aa>] _spin_lock+0x16/0x7c
    [<c02e7cc8>] xfs_lookup+0x55/0x8a
    [<c02f4736>] linvfs_lookup+0x52/0x99
    [<c01698a2>] real_lookup+0xc2/0xe3
    [<c0169b2c>] do_lookup+0x96/0xa1
    [<c0169cd0>] link_path_walk+0x199/0xe3a
    [<c012a2f1>] do_notify_parent+0x108/0x214
    [<c016ac39>] path_lookup+0x97/0x15f
    [<c0166612>] open_exec+0x2f/0x102
    [<c011834b>] task_rq_lock+0x36/0x66
    [<c01676ed>] do_execve+0x42/0x201
    [<c0101cc1>] sys_execve+0x46/0x9c
    [<c010318b>] syscall_call+0x7/0xb
    [<c012e60e>] ____call_usermodehelper+0xa1/0xc0
    [<c012e56d>] ____call_usermodehelper+0x0/0xc0
    [<c0101319>] kernel_thread_helper+0x5/0xb

    Does the XFS Module avoid preemption rules? If so, why?

    Thanks
    Matthias-Christian Ott

    --
    http://unixforge.org/~matthias-christian-ott/

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