Messages in this thread | | | Date | Fri, 22 Feb 2008 16:43:40 -0800 | From | "Bill Huey (hui)" <> | Subject | Re: [PATCH [RT] 11/14] optimize the !printk fastpath through the lock acquisition |
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On Fri, Feb 22, 2008 at 2:20 PM, Gregory Haskins <gregory.haskins.ml@gmail.com> wrote: > Agreed, but it's still correct afaict. I added an extra might_sleep() > to a path that really might sleep. I should have mentioned that in the > header. > > In any case, its moot. Andi indicated this patch is probably a no-op so > I was considering dropping it on the v2 pass.
The might_sleep is annotation and well as a conditional preemption point for the regular kernel. You might want to do a schedule check there, but it's the wrong function if memory serves me correctly. It's reserved for things that actually are design to sleep. The rt_spin*() function are really a method of preserving BKL semantics across real schedule() calls. You'd have to use something else instead for that purpose like cond_reschedule() instead.
bill
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