Re: aio stress panic on 2.6.11-mm1

From: Suparna Bhattacharya
Date: Wed Mar 09 2005 - 06:01:33 EST

Any sense of how costly it is to use spin_lock_irq's vs spin_lock
(across different architectures) ? Isn't rwsem used very widely ?


On Wed, Mar 09, 2005 at 10:33:58AM +0000, David Howells wrote:
> Andrew Morton <akpm@xxxxxxxx> wrote:
> > If we want to take the spinlock from interrupt context, the non-interrupt
> > context code needs to do spin_lock_irq(), not spin_lock().
> Yeah. I think I had a patch for that somewhere, but I think Linus turned it
> down. I can't find any emails on that subject though. I'll knock together a
> new patch for it.
> David
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Suparna Bhattacharya (suparna@xxxxxxxxxx)
Linux Technology Center
IBM Software Lab, India

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