Re: cpufreq: mediatek: allow modular build

From	Viresh Kumar <viresh.kumar@linaro.org>
Newsgroups	linux.kernel
Subject	Re: cpufreq: mediatek: allow modular build
Date	2015-09-11 12:20 +0200
Message-ID	<q7tB0-71O-23@gated-at.bofh.it> (permalink)
References	(5 earlier) <q7sYi-63o-15@gated-at.bofh.it> <q7t7Y-6eG-19@gated-at.bofh.it> <q7thE-6pR-23@gated-at.bofh.it> <q7trk-6Qv-19@gated-at.bofh.it> <q7tB0-71O-7@gated-at.bofh.it>
Organization	linux.* mail to news gateway

Show all headers | View raw

On 11-09-15, 11:13, Russell King - ARM Linux wrote:
> Yes, but it's not that simple.
> 
> A module with no module_init() and no module_exit() is what's called a
> library module, which can be inserted, and later removed provided no
> other module depends on anything the library module exports.
> 
> A module with a module_init() but no module_exit() is one which can be
> inserted, but never removed.
> 
> A module with a module_init() and a module_exit() can be inserted, and
> later removed in much the same way as the library module mentioned above.
> 
> See kernel/module.c:
> 
>         /* If it has an init func, it must have an exit func to unload */
>         if (mod->init && !mod->exit) {
>                 forced = try_force_unload(flags);
>                 if (!forced) {
>                         /* This module can't be removed */
>                         ret = -EBUSY;
>                         goto out;
>                 }
>         }
> 
> and
> 
>         if (mod->init != NULL && mod->exit == NULL) {
>                 printed_something = 1;
>                 seq_puts(m, "[permanent],");
>         }

Thanks for that, really appreciate it.

And now I realize that Arnd was correct to start with :)

-- 
viresh
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Thread

cpufreq: mediatek: allow modular build Arnd Bergmann <arnd@arndb.de> - 2015-09-11 10:20 +0200
  Re: cpufreq: mediatek: allow modular build Viresh Kumar <viresh.kumar@linaro.org> - 2015-09-11 10:20 +0200
    Re: cpufreq: mediatek: allow modular build Viresh Kumar <viresh.kumar@linaro.org> - 2015-09-11 10:30 +0200
      Re: cpufreq: mediatek: allow modular build Arnd Bergmann <arnd@arndb.de> - 2015-09-11 10:40 +0200
        Re: cpufreq: mediatek: allow modular build Viresh Kumar <viresh.kumar@linaro.org> - 2015-09-11 10:40 +0200
          Re: cpufreq: mediatek: allow modular build Russell King - ARM Linux <linux@arm.linux.org.uk> - 2015-09-11 11:40 +0200
            Re: cpufreq: mediatek: allow modular build Viresh Kumar <viresh.kumar@linaro.org> - 2015-09-11 11:50 +0200
              Re: cpufreq: mediatek: allow modular build Russell King - ARM Linux <linux@arm.linux.org.uk> - 2015-09-11 12:00 +0200
                Re: cpufreq: mediatek: allow modular build Viresh Kumar <viresh.kumar@linaro.org> - 2015-09-11 12:10 +0200
                Re: cpufreq: mediatek: allow modular build Russell King - ARM Linux <linux@arm.linux.org.uk> - 2015-09-11 12:20 +0200
                Re: cpufreq: mediatek: allow modular build Viresh Kumar <viresh.kumar@linaro.org> - 2015-09-11 12:20 +0200
    Re: cpufreq: mediatek: allow modular build Arnd Bergmann <arnd@arndb.de> - 2015-09-11 10:30 +0200

csiph-web