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The generic kernel mode FPU API, which is used by the AMDGPU driver to perform floating point calculations, is modeled after the most restrictive architecture that supports it. This means it doesn't support preemption, and can only be used from task context. The arm64 implementation is a bit more flexible, but supporting that in the generic API complicates matters slightly, and for no good reason, given that the only user does not need it. So enforce that kernel_fpu_begin() can only be called from task context, and [redundantly] disable preemption. This removes the need for users of this API to provide a kernel mode FP/SIMD state after a future patch that makes that compulsory for preemptible task context. Acked-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
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 reStructuredText 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.