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The branch is a stable branch shared with ARM maintainers for the first 13th patches of the series: It is based on v5.14-rc3. As stated by the changelog: " [... ] enabling ARMv8.6 support for timer subsystem, and was prompted by a discussion with Oliver around the fact that an ARMv8.6 implementation must have a 1GHz counter, which leads to a number of things to break in the timer code: - the counter rollover can come pretty quickly as we only advertise a 56bit counter, - the maximum timer delta can be remarkably small, as we use the countdown interface which is limited to 32bit... Thankfully, there is a way out: we can compute the minimal width of the counter based on the guarantees that the architecture gives us, and we can use the 64bit comparator interface instead of the countdown to program the timer. Finally, we start making use of the ARMv8.6 ECV features by switching accesses to the counters to a self-synchronising register, removing the need for an ISB. Hopefully, implementations will *not* just stick an invisible ISB there... A side effect of the switch to CVAL is that XGene-1 breaks. I have added a workaround to keep it alive. I have added Oliver's original patch[0] to the series and tweaked a couple of things. Blame me if I broke anything. The whole things has been tested on Juno (sysreg + MMIO timers), XGene-1 (broken sysreg timers), FVP (FEAT_ECV, CNT*CTSS_EL0). " Link: https://lore.kernel.org/r/20211017124225.3018098-1-maz@kernel.org Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
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.