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Use KERNEL_VXR_LOW instead of KERNEL_VXR_V0V7 for configurations without vector registers in order to decide if floating point registers need to be saved and restored. Kernel FPU areas which use floating point registers are supposed to use the KERNEL_FPR mask, however users may also open-code this and specify KERNEL_VXR_V0V7 and/or KERNEL_VXR_V8V15. If only KERNEL_VXR_V8V15 is specified floating point registers wouldn't be saved and restored. Improve this and check for both bits. There are currently no users where this would fix a bug. Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.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.