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[ Upstream commit88b9a3d142] The xmon debugger IPI handler waits in the callback function while xmon is still active. This means they don't complete the IPI, and the initiator always times out waiting for them. Things manage to work after the timeout because there is some fallback logic to keep NMI IPI state sane in case of the timeout, but this is a bit ugly. This patch changes NMI IPI back to half-asynchronous (i.e., wait for everyone to call in, do not wait for IPI function to complete), but the complexity is avoided by going one step further and allowing new IPIs to be issued before the IPI functions to all complete. If synchronization against that is required, it is left up to the caller, but current callers don't require that. In fact with the timeout handling, callers must be able to cope with this already. Fixes:5b73151fff("powerpc: NMI IPI make NMI IPIs fully sychronous") Cc: stable@vger.kernel.org # v4.19+ Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
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.