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Bibo Mao
fe2a449a45
tick_shutdown() sets the state of the clockevent device to detached first and the invokes clockevents_exchange_device(), which in turn invokes clockevents_switch_state(). But clockevents_switch_state() returns without invoking the device shutdown callback as the device is already in detached state. As a consequence the timer device is not shutdown when a CPU goes offline. tick_shutdown() does this because it was originally invoked on a online CPU and not on the outgoing CPU. It therefore could not access the clockevent device of the already offlined CPU and just set the state. Since commit3b1596a21ftick_shutdown() is called on the outgoing CPU, so the hardware device can be accessed. Remove the state set before calling clockevents_exchange_device(), so that the subsequent clockevents_switch_state() handles the state transition and invokes the shutdown callback of the clockevent device. [ tglx: Massaged change log ] Fixes:3b1596a21f("clockevents: Shutdown and unregister current clockevents at CPUHP_AP_TICK_DYING") Signed-off-by: Bibo Mao <maobibo@loongson.cn> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Frederic Weisbecker <frederic@kernel.org> Link: https://lore.kernel.org/all/20250906064952.3749122-2-maobibo@loongson.cn
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 reStructuredText 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.