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GNU as warns twice for this file: Warning: using r15 results in unpredictable behaviour via the Arm ARM: K1.1.1 Overview of the constraints on Armv7 UNPREDICTABLE behaviors The term UNPREDICTABLE describes a number of cases where the architecture has a feature that software must not use. Ard notes: These are selftests that aim to ensure that kprobe never attempts to replace the opcodes in question with a probe, but they are not actually executed, or expected to occur in real code. Reported-by: kernelci.org bot <bot@kernelci.org> Suggested-by: Peter Smith <peter.smith@arm.com> Suggested-by: Renato Golin <rengolin@systemcall.eu> Suggested-by: David Spickett <david.spickett@linaro.org> Signed-off-by: Nick Desaulniers <ndesaulniers@google.com> Acked-by: Ard Biesheuvel <ardb@kernel.org> Link: https://github.com/ClangBuiltLinux/linux/issues/1271 Link: https://reviews.llvm.org/D95586 Bug: 141693040 Link: https://lore.kernel.org/linux-arm-kernel/20210211025149.3544593-2-ndesaulniers@google.com/ Change-Id: I42333d7e64a98f739ab13916f61a587143fec7f8
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.
See Documentation/00-INDEX for a list of what is contained in each file.
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.