Roman Zippel wrote:
>
> Hi,
>
> Robert Love wrote:
>
> > Right, I meant just the spin_lock_irq case, which would be fine except
> > for the case where:
> >
> > spin_lock_irq
> > spin_unlock
> > restore_irq
> >
> > to solve this, we need a spin_unlock_irq_on macro that didn't touch the
> > preemption count.
>
> Has someone a real example of something like this?
> I'd suspect someone is trying a (questionable) micro optimization or is
> holding the lock for too long anyway. Instead of adding more macros,
> maybe it's better to look closely whether something needs fixing.
>
Oh it is in there somewhere. I tried to do the indicated thing for
preemption and ran aground on it. Grep drivers for spin_lock_irq (or
irq save). I don't remember which, but there is more than one.
-- George george@mvista.com High-res-timers: http://sourceforge.net/projects/high-res-timers/ Real time sched: http://sourceforge.net/projects/rtsched/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
This archive was generated by hypermail 2b29 : Fri Dec 07 2001 - 21:00:27 EST