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e75bef2a4f
It is probably safe to assume that all Armv8-A implementations have a multiplier whose efficiency is comparable or better than a sequence of three or so register-dependent arithmetic instructions. Select ARCH_HAS_FAST_MULTIPLIER to get ever-so-slightly nicer codegen in the few dusty old corners which care. In a contrived benchmark calling hweight64() in a loop, this does indeed turn out to be a small win overall, with no measurable impact on Cortex-A57 but about 5% performance improvement on Cortex-A53. Acked-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Robin Murphy <robin.murphy@arm.com> 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.
See Documentation/00-INDEX for a list of what is contained in each file.
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.