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4797e9b506
Implement raw_smp_processor_id() with an inline assembly, which makes use of the ALTERNATIVE macro, to read cpu_nr from lowcore. Provide an alternative instruction with a different offset in case lowcore is relocated. This replaces sequences of two instructions with one instruction. Before: 1000b6: a5 1e 00 00 llilh %r1,0 1000ba: 58 20 13 a0 l %r2,928(%r1) After: 1000b6: e3 20 03 a0 00 58 ly %r2,928 Kernel image size change: add/remove: 753/755 grow/shrink: 230/1510 up/down: 30538/-35832 (-5294) Acked-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@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 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.