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We provide interfaces for configuring the SVE vector length seen by processes using prctl and also via /proc for configuring the default values. Provide tests that exercise all these interfaces and verify that they take effect as expected, though at present no test fully enumerates all the possible vector lengths. A subset of this is already tested via sve-probe-vls but the /proc interfaces are not currently covered at all. In preparation for the forthcoming support for SME, the Scalable Matrix Extension, which has separately but similarly configured vector lengths which we expect to offer similar userspace interfaces for, all the actual files and prctls used are parameterised and we don't validate that the architectural minimum vector length is the minimum we see. Signed-off-by: Mark Brown <broonie@kernel.org> Reviewed-by: Dave Martin <Dave.Martin@arm.com> Link: https://lore.kernel.org/r/20210803140450.46624-4-broonie@kernel.org Signed-off-by: Catalin Marinas <catalin.marinas@arm.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.