Paul Burton
48016e78d3
The MIPS GIC timer is well suited for use as sched_clock, so register it as such. Whilst the existing gic_read_count() function matches the prototype needed by sched_clock_register() already, we split it into 2 functions in order to remove the need to evaluate the mips_cm_is64 condition within each call since sched_clock should be as fast as possible. Note the sched clock framework needs the clock source being stable in order to rely on it. So we register the MIPS GIC timer as schedule clocks only if it's, if either the system doesn't have CPU-frequency enabled or the CPU frequency is changed by means of the CPC core clock divider available on the platforms with CM3 or newer. Signed-off-by: Paul Burton <paulburton@kernel.org> Co-developed-by: Serge Semin <Sergey.Semin@baikalelectronics.ru> [Sergey.Semin@baikalelectronics.ru: Register sched-clock if CM3 or !CPU-freq] Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru> Cc: Alexey Malahov <Alexey.Malahov@baikalelectronics.ru> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Alessandro Zummo <a.zummo@towertech.it> Cc: Alexandre Belloni <alexandre.belloni@bootlin.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Rob Herring <robh+dt@kernel.org> Cc: linux-mips@vger.kernel.org Cc: linux-rtc@vger.kernel.org Cc: devicetree@vger.kernel.org Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Link: https://lore.kernel.org/r/20200521204818.25436-8-Sergey.Semin@baikalelectronics.ru
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.