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159fd7b8d3
Writes to ZCR_EL1 are self-synchronising, and so may be expensive in typical implementations. This patch adopts the approach used for costly system register writes elsewhere in the kernel: the system register write is suppressed if it would not change the stored value. Since the common case will be that of switching between tasks that use the same vector length as one another, prediction hit rates on the conditional branch should be reasonably good, with lower expected amortised cost than the unconditional execution of a heavyweight self-synchronising instruction. Signed-off-by: Dave Martin <Dave.Martin@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> |
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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.