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The text_dma.S code uses its own macro to generate an inline version of an expoline. To make it easier to identify all expolines in the kernel use a thunk and a branch to the thunk just like the rest of the kernel code does it. The name of the text_dma.S expoline thunk is __dma__s390_indirect_jump_r14 and the section is named .dma.text.__s390_indirect_jump_r14. This will be needed for the objtool support. Signed-off-by: Martin Schwidefsky <schwidefsky@de.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.