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The stop/shutdown op should not use decrementer_set_next_event because that sets decrementers_next_tb to now + decrementer_max, which means a decrementer interrupt that occurs after that time will call the clockevent event handler unexpectedly. Set next_tb to ~0 here to prevent any clock event call. Init all clockevents to stopped. Then the decrementer clockevent device always has event_handler set and applicable because we know the clock event device was not stopped. So make this call unconditional to show that it is always called. next_tb need not be set to ~0 before the event handler is called because it will stop the clockevent device if there is no other timer. Finally, the timer broadcast interrupt should not modify next_tb because it is not involved with the local decrementer clockevent on this CPU. This doesn't fix a known bug, just tidies the code. Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20220124143930.3923442-3-npiggin@gmail.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.
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.