On 08/02/2013 12:29 PM, Viresh Kumar wrote:
On 2 August 2013 12:19, Srivatsa S. Bhat srivatsa.bhat@linux.vnet.ibm.com wrote:
But lsmod shows 0 for the cpufreq driver right? (Note, your related_cpus should have only 1 CPU each, for you to see 0. Else, you'll see a non-zero value due to the very bug/inconsistency that Rafael is fixing in this patch).
I have hacked the driver this way:
@@ -2114,10 +2114,16 @@ int cpufreq_register_driver(struct cpufreq_driver *driver_data) cpufreq_driver = driver_data; write_unlock_irqrestore(&cpufreq_driver_lock, flags);
printk(KERN_INFO "%s: Module refcount: %lu\n", __func__,module_refcount(cpufreq_driver->owner));ret = subsys_interface_register(&cpufreq_interface); if (ret) goto err_null_driver;And this gave me 1..
Well, on my system, lsmod shows:
acpi_cpufreq 13643 0
The last column is the refcount, as printed by: kernel/module.c: print_unload_info()
913 seq_printf(m, " %lu ", module_refcount(mod));
I guess you are printing it at an odd time, when the module is still running its init function. Perhaps the core kernel module infrastructure increments the refcount around that region temporarily?
Regards, Srivatsa S. Bhat