From mboxrd@z Thu Jan 1 00:00:00 1970 From: arnd@arndb.de (Arnd Bergmann) Date: Fri, 11 Sep 2015 10:22:39 +0200 Subject: cpufreq: mediatek: allow modular build In-Reply-To: <20150911081753.GK9650@linux> References: <1768766.yu1lxjsjLL@wuerfel> <20150911081753.GK9650@linux> Message-ID: <2329563.MhTbBXHVz1@wuerfel> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Friday 11 September 2015 13:47:53 Viresh Kumar wrote: > On 11-09-15, 10:15, Arnd Bergmann wrote: > > The newly merged cpufreq-mt8173 driver breaks the ARM allmodconfig > > build because of a dependency on the cpu-cooling infrastructure that > > may be built as a loadable module: > > > > drivers/built-in.o: In function `mtk_cpufreq_ready': > > binder.c:(.text+0x324c8c): undefined reference to `of_cpufreq_cooling_register' > > drivers/built-in.o: In function `mtk_cpufreq_exit': > > binder.c:(.text+0x324ea0): undefined reference to `cpufreq_cooling_unregister' > > > > This works around the issue by allowing this driver to be built > > as a module as well, and adding a dependency on THERMAL that prevents > > it from being built-in when the cpu-cooling driver is a module. > > > > This is not perfect because there is still a case where THERMAL=m > > and CPU_COOLING=n that should allow us to have this driver built-in > > as well, but I decided to follow existing practice in other drivers > > here, and that case seems irrelevant in practice. > > > > Signed-off-by: Arnd Bergmann > > --- > > I have not checked if someone else has already sent a patch for this, > > just ignore mine if the issue has been fixed already. > > 5269e7067cd6 ("cpufreq: Add ARM_MT8173_CPUFREQ dependency on THERMAL") > > in Rafael's tree. Its a bit different, so have a look. That fix looks correct to me too, thanks for the quick reply! In my approach, I decided to allow the driver to be a module, as that seems nicer for multi_v7_defconfig, but I now see that there are several other drivers that can only be built-in, so if we decided to make that the general strategy we should change them all. Arnd