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In preparation for code removal change parameters to branch and call adjustment functions to be more universal. The current parameters assume we are patching a single instruction with a longer set. A diagram may help reading the change, this is for the patch single case, patching instruction 1 with a replacement of 4: ____ 0 |____| 1 |____| <-- pos ^ 2 | | <-- end old ^ | 3 | | | delta | len 4 |____| | | (patch region) 5 | | <-- end new v v 6 |____| end_old = pos + 1 end_new = pos + delta + 1 If we are before the patch region - curr variable and the target are fully in old coordinates (hence comparing against end_old). If we are after the region curr is in new coordinates (hence the comparison to end_new) but target is in mixed coordinates, so we just check if it falls before end_new, and if so it needs the adjustment. Note that we will not fix up branches which land in removed region in case of removal, which should be okay, as we are only going to remove dead code. Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com> Acked-by: Yonghong Song <yhs@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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.