hrtimers: Introduce hrtimer_update_function()

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Some users of hrtimer need to change the callback function after the
initial setup. They write to hrtimer::function directly.

That's not safe under all circumstances as the write is lockless and a
concurrent timer expiry might end up using the wrong function pointer.

Introduce hrtimer_update_function(), which also performs runtime checks
whether it is safe to modify the callback.

This allows to make hrtimer::function private once all users are converted.

Signed-off-by: Nam Cao <namcao@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/all/20a937b0ae09ad54b5b6d86eabead7c570f1b72e.1730386209.git.namcao@linutronix.de

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Nam Cao 2024-10-31 16:14:23 +01:00 • committed by Thomas Gleixner

parent c9bd83abfe

commit 8f02e3563b

1 changed files with 22 additions and 0 deletions

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include/linux/hrtimer.h

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