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As a step towards ensuring the atomic* APIs are consistent, let's switch to wrappers generated by gen-atomic-instrumented.h, using the same table used to generate the fallbacks and atomic-long wrappers. These are checked in rather than generated with Kbuild, since: * This allows inspection of the atomics with git grep and ctags on a pristine tree, which Linus strongly prefers being able to do. * The fallbacks are not affected by machine details or configuration options, so it is not necessary to regenerate them to take these into account. * These are included by files required *very* early in the build process (e.g. for generating bounds.h), and we'd rather not complicate the top-level Kbuild file with dependencies. Generating the atomic headers means that the instrumented wrappers will remain in sync with the rest of the atomic APIs, and we gain all the ordering variants of each atomic without having to manually expanded them all. The KASAN checks are automatically generated based on the function parameters defined in atomics.tbl. Note that try_cmpxchg() now correctly treats 'old' as a parameter that may be written to, and not only read as the hand-written instrumentation assumed. Other than the change to try_cmpxchg(), existing code should not be affected by this patch. The patch introduces instrumentation for all optional atomics (and ordering variants), along with the ifdeffery this requires, enabling other architectures to make use of the instrumented atomics. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by: Will Deacon <will.deacon@arm.com> Cc: linux-arm-kernel@lists.infradead.org Cc: catalin.marinas@arm.com Cc: linuxdrivers@attotech.com Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Boqun Feng <boqun.feng@gmail.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Andrey Ryabinin <aryabinin@virtuozzo.com> Cc: Alexander Potapenko <glider@google.com> Link: http://lkml.kernel.org/r/20180904104830.2975-5-mark.rutland@arm.com Signed-off-by: Ingo Molnar <mingo@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.
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.