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SubjectBUG: using smp_processor_id() in preemptible [00000000] code: dellWirelessCtl/...
I see this often (all the time) with v2.6.28-5716-gfe0bdec. It is a
Dell XPS M1330 (iwl3945, the newer, "...-2" firmware).

Jan 5 19:49:36 blimp kernel: BUG: using smp_processor_id() in preemptible [00000000] code: dellWirelessCtl/14180
Jan 5 19:49:36 blimp kernel: caller is smi_request+0x89/0xc8
Jan 5 19:49:36 blimp kernel: Pid: 14180, comm: dellWirelessCtl Not tainted 2.6.28-t #146
Jan 5 19:49:36 blimp kernel: Call Trace:
Jan 5 19:49:36 blimp kernel: [<ffffffff8033ee83>] debug_smp_processor_id+0xdb/0xf0
Jan 5 19:49:36 blimp kernel: [<ffffffff8046a6d8>] smi_request+0x89/0xc8
Jan 5 19:49:36 blimp kernel: [<ffffffff8046a78e>] smi_request_store+0x77/0xa5
Jan 5 19:49:36 blimp kernel: [<ffffffff803c69cb>] dev_attr_store+0x1e/0x20
Jan 5 19:49:36 blimp kernel: [<ffffffff802e66e8>] sysfs_write_file+0xe4/0x119
Jan 5 19:49:36 blimp kernel: [<ffffffff802a0084>] vfs_write+0xae/0x124
Jan 5 19:49:36 blimp kernel: [<ffffffff802a01be>] sys_write+0x47/0x70
Jan 5 19:49:36 blimp kernel: [<ffffffff8020b69b>] system_call_fastpath+0x16/0x1b

The function smi_request:

/**
* smi_request: generate SMI request
*
* Called with smi_data_lock.
*/
static int smi_request(struct smi_cmd *smi_cmd)
{
cpumask_t old_mask;
int ret = 0;

if (smi_cmd->magic != SMI_CMD_MAGIC) {
dev_info(&dcdbas_pdev->dev, "%s: invalid magic value\n",
__func__);
return -EBADR;
}

/* SMI requires CPU 0 */
old_mask = current->cpus_allowed;
set_cpus_allowed_ptr(current, &cpumask_of_cpu(0));
if (smp_processor_id() != 0) { <==== here?
dev_dbg(&dcdbas_pdev->dev, "%s: failed to get CPU 0\n",
__func__);
ret = -EBUSY;
goto out;
}

/* generate SMI */
asm volatile (
"outb %b0,%w1"
: /* no output args */
: "a" (smi_cmd->command_code),
"d" (smi_cmd->command_address),
"b" (smi_cmd->ebx),
"c" (smi_cmd->ecx)
: "memory"
);

out:
set_cpus_allowed_ptr(current, &old_mask);
return ret;
}



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