mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2026-04-23 02:43:38 -04:00
55c8a987dd
Currently we set -march=armv8.5+memtag when building the MTE selftests, allowing the compiler to emit v8.5 and MTE instructions for anything it generates. This means that we may get code that will generate SIGILLs when run on older systems rather than skipping on non-MTE systems as should be the case. Most toolchains don't select any incompatible instructions but I have seen some reports which suggest that some may be appearing which do so. This is also potentially problematic in that if the compiler chooses to emit any MTE instructions for the C code it may interfere with the MTE usage we are trying to test. Since the only reason we are specifying this option is to allow us to assemble MTE instructions in mte_helper.S we can avoid these issues by moving to using a .arch directive there and adding the -march explicitly to the toolchain support check instead of the generic CFLAGS. Signed-off-by: Mark Brown <broonie@kernel.org> Link: https://lore.kernel.org/r/20220928154517.173108-1-broonie@kernel.org Signed-off-by: Catalin Marinas <catalin.marinas@arm.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.