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[ Upstream commite33416fca8] Commit41b7a347bf("powerpc: Book3S 64-bit outline-only KASAN support") added a select of ARCH_WANTS_NO_INSTR, because it also added some uses of noinstr. However noinstr is always defined, regardless of ARCH_WANTS_NO_INSTR, so there's no need to select it just for that. As PeterZ says [1]: Note that by selecting ARCH_WANTS_NO_INSTR you effectively state to abide by its rules. As of now the powerpc code does not abide by those rules, and trips some new warnings added by Peter in linux-next. So until the code can be fixed to avoid those warnings, disable ARCH_WANTS_NO_INSTR. Note that ARCH_WANTS_NO_INSTR is also used to gate building KCOV and parts of KCSAN. However none of the noinstr annotations in powerpc were added for KCOV or KCSAN, instead instrumentation is blocked at the file level using KCOV_INSTRUMENT_foo.o := n. [1]: https://lore.kernel.org/linuxppc-dev/Y9t6yoafrO5YqVgM@hirez.programming.kicks-ass.net Reported-by: Sachin Sant <sachinp@linux.ibm.com> Suggested-by: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Signed-off-by: Sasha Levin <sashal@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.