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02da363241
commit3c12b4df8dupstream. The mitigation-patching.sh script in the powerpc selftests toggles all mitigations on and off simultaneously, revealing that rfi_flush and stf_barrier cannot safely operate at the same time due to races in updating the static key. On some systems, the static key code throws a warning and the kernel remains functional. On others, the kernel will hang or crash. Fix this by slapping on a mutex. Fixes:13799748b9("powerpc/64: use interrupt restart table to speed up return from interrupt") Cc: stable@vger.kernel.org # v5.14+ Signed-off-by: Russell Currey <ruscur@russell.cc> Acked-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20211027072410.40950-1-ruscur@russell.cc Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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.