Messages in this thread | | | Date | Thu, 6 Mar 2014 21:52:42 +0100 (CET) | From | Thomas Gleixner <> | Subject | Re: preempt_check_resched() gone? |
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On Thu, 6 Mar 2014, Ville Syrjälä wrote: > Hi, > > It appears preempt_check_resched() is no longer available for modules > since [1]. So now I'm left wondering what is one supposed to use after > local_irq_enable(). Documentation/preempt-locking.txt still says one > should do a check, but the tool to do that was taken away.
The documentation is slightly misleading. The point is:
If you have an irq disabled section and you do a wakeup inside this section which causes the need resched bit to be set, then local_irq_enable/restore wont do an preemption check.
If you merily poke at a few device registers then nothing will set need resched and you're good.
Thanks,
tglx
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