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A timer might be used as a pinned timer (using add_timer_on()) and later on as non-pinned timer using add_timer(). When the "NOHZ timer pull at expiry model" is in place, the TIMER_PINNED flag is required to be used whenever a timer needs to expire on a dedicated CPU. Otherwise the flag must not be set if expiration on a dedicated CPU is not required. add_timer_on()'s behavior will be changed during the preparation patches for the "NOHZ timer pull at expiry model" to unconditionally set the TIMER_PINNED flag. To be able to clear/ set the flag when queueing a timer, two variants of add_timer() are introduced. This is a preparatory step and has no functional change. Signed-off-by: Anna-Maria Behnsen <anna-maria@linutronix.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Frederic Weisbecker <frederic@kernel.org> Link: https://lore.kernel.org/r/20240221090548.36600-6-anna-maria@linutronix.de
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.