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Setting of clocks triggers an unconditional SMP function call on all online CPUs to reprogram the clock event device. However, only some clocks have their offsets updated and therefore potentially require a reprogram. That's CLOCK_REALTIME and CLOCK_TAI and in the case of resume (delayed sleep time injection) also CLOCK_BOOTTIME. Instead of sending an IPI unconditionally, check each per CPU hrtimer base whether it has active timers in the affected clock bases which are indicated by the caller in the @bases argument of clock_was_set(). If that's not the case, skip the IPI and update the offsets remotely which ensures that any subsequently armed timers on the affected clocks are evaluated with the correct offsets. [ tglx: Adopted to the new bases argument, removed the softirq_active check, added comment, fixed up stale comment ] Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Link: https://lore.kernel.org/r/20210713135158.787536542@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.