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793acf870e
On SMP ARM systems, cache maintenance by set/way should only ever be done in the context of onlining or offlining CPUs, which is typically done by bare metal firmware and never in a virtual machine. For this reason, we trap set/way cache maintenance operations and replace them with conditional flushing of the entire guest address space. Due to this trapping, the set/way arguments passed into the set/way ops are completely ignored, and thus irrelevant. This also means that the set/way geometry is equally irrelevant, and we can simply report it as 1 set and 1 way, so that legacy 32-bit ARM system software (i.e., the kind that only receives odd fixes) doesn't take a performance hit due to the trapping when iterating over the cachelines. Acked-by: Christoffer Dall <christoffer.dall@arm.com> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@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.
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.