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commit809232619fupstream. The membarrier command MEMBARRIER_CMD_QUERY allows querying the available membarrier commands. When the membarrier-rseq fence commands were added, a new MEMBARRIER_CMD_PRIVATE_EXPEDITED_RSEQ_BITMASK was introduced with the intent to expose them with the MEMBARRIER_CMD_QUERY command, the but it was never added to MEMBARRIER_CMD_BITMASK. The membarrier-rseq fence commands are therefore not wired up with the query command. Rename MEMBARRIER_CMD_PRIVATE_EXPEDITED_RSEQ_BITMASK to MEMBARRIER_PRIVATE_EXPEDITED_RSEQ_BITMASK (the bitmask is not a command per-se), and change the erroneous MEMBARRIER_CMD_REGISTER_PRIVATE_EXPEDITED_RSEQ_BITMASK (which does not actually exist) to MEMBARRIER_CMD_REGISTER_PRIVATE_EXPEDITED_RSEQ. Wire up MEMBARRIER_PRIVATE_EXPEDITED_RSEQ_BITMASK in MEMBARRIER_CMD_BITMASK. Fixing this allows discovering availability of the membarrier-rseq fence feature. Fixes:2a36ab717e("rseq/membarrier: Add MEMBARRIER_CMD_PRIVATE_EXPEDITED_RSEQ") Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: <stable@vger.kernel.org> # 5.10+ Link: https://lkml.kernel.org/r/20220117203010.30129-1-mathieu.desnoyers@efficios.com 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.