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Russell King says: ==================== net: stmmac: correctly populate ptp_clock_ops.getcrosststamp While reviewing code in the stmmac PTP driver, I noticed that the getcrosststamp() method is always populated, irrespective of whether it is implemented or not by the stmmac platform specific glue layer. Where a platform specific glue layer does not implement it, the core stmmac driver code returns -EOPNOTSUPP. However, the PTP clock core code uses the presence of the method in ptp_clock_ops to determine whether this facility should be advertised to userspace (see ptp_clock_getcaps()). Moreover, the only platform glue that implements this method is the Intel glue, and for it not to return -EOPNOTSUPP, the CPU has to support X86_FEATURE_ART. This series updates the core stmmac code to only provide the getcrosststamp() method in ptp_clock_ops when the platform glue code provides an implementation, and then updates the Intel glue code to only provide its implementation when the CPU has the necessary X86_FEATURE_ART feature. ==================== Link: https://patch.msgid.link/aLhJ8Gzb0T2qpXBE@shell.armlinux.org.uk Signed-off-by: Jakub Kicinski <kuba@kernel.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 reStructuredText 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.