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Provide MARCH_HAS_*_FEATURES defines which are supposed to be used everywhere instead of the CONFIG_HAVE_MARCH_*_FEATURES defines. Various header files contain code which depend on the CONFIG_HAVE_MARCH_*_FEATURES defines, allowing for compile time optimizations. If such code is used within the decompressor wrong code may be generated (the compiler may generate instructions which are not available for the minimum architecture level of the decompressor). Therefore provide a new header file with MARCH_HAS_*_FEATURES defines, which are only available if __DECOMPRESSOR is not defined. This way code generation for the kernel image is still optimized depending on CONFIG_HAVE_MARCH_*_FEATURES, while code generated for the decompressor is compiled for the minimum architecture level. Reviewed-by: Sven Schnelle <svens@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 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.