From: Jeff Garzik <jgarzik@pobox.com>
Date: Tue, 25 Mar 2008 22:23:24 -0400

quoted text
> This is bogus -- you should never need to slow down the hot path in such 
> a way.

Slow down in what way?  Even on x86 saving the flags is just
about as expensive as a plain sti/cli.

I would in fact prefer to see drivers unconditionally use
spin_lock_irqsave() et al. in the interrupt handler, for
consistency.
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