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The "Timeout: Not all CPUs entered broadcast exception handler" message will appear from time to time given enough systems, but this message does not identify which CPUs failed to enter the broadcast exception handler. This information would be valuable if available, for example, in order to correlate with other hardware-oriented error messages. Add a cpumask of CPUs which maintains which CPUs have entered this handler, and print out which ones failed to enter in the event of a timeout. [ bp: Massage. ] Reported-by: Jonathan Lemon <bsd@fb.com> Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Borislav Petkov <bp@suse.de> Tested-by: Tony Luck <tony.luck@intel.com> Link: https://lkml.kernel.org/r/20210106174102.GA23874@paulmck-ThinkPad-P72
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.