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The VLGV macro generates the VLGV instruction and has a vr parameter which correlates to the V3 vector register field of the instruction (bits 12-15). Due to its position in the VRS-c instruction format of the VLGV instruction, this field correlates to the second bit of the RXB byte of the instruction (see Principles of Operation, Chapter "Vector Overview and Support Instructions"). Within the VLGV macro the MRXBOPC macro is used to generate the RXB field of the instruction. The usage of the MRXBOPC macro is incorrect, since the vector register number is passed as third parameter (which correlates to the first bit of the RXB byte), while it should be passed as fourth parameter (second bit of the RXB byte). In result an incorrect instruction would be generated if the VLGV macro would be used for vector register numbers larger than 15. Fix this and pass the vector register number as fourth parameter. Currently there are no users within the kernel which use the macro in a way that broken code would be generated. Reviewed-by: Jens Remus <jremus@linux.ibm.com> Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com> Reviewed-by: Hendrik Brueckner <brueckner@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.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.