fcf3513139
The upcoming s390 branch length extension patches rely on "passes do not increase code size" property in order to consistently choose between short and long branches. Currently this property does not hold between the first and the second passes for register save/restore sequences, as well as various code fragments that depend on SEEN_* flags. Generate the code during the first pass conservatively: assume register save/restore sequences have the maximum possible length, and that all SEEN_* flags are set. Also refuse to JIT if this happens anyway (e.g. due to a bug), as this might lead to verifier bypass once long branches are introduced. Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Link: https://lore.kernel.org/bpf/20191114151820.53222-1-iii@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 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.