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The initial assumption that all VDSO related data can be completely generic does not hold. S390 needs architecture specific storage to access the clock steering information. Add struct arch_vdso_data to the vdso data struct. For architectures which do not need extra data this defaults to an empty struct. Architectures which require it, enable CONFIG_ARCH_HAS_VDSO_DATA and provide their specific struct in asm/vdso/data.h. Signed-off-by: Sven Schnelle <svens@linux.ibm.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Link: https://lkml.kernel.org/r/20200804150124.41692-2-svens@linux.ibm.com
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.