David Miller 写道:
quoted text
> From: Jeff Garzik <jgarzik@pobox.com>
> Date: Tue, 25 Mar 2008 22:23:24 -0400
>
>   
>> 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.
>   
Yes, I agree. Many NIC drivers do the same thing, like Gianfar, E1000, etc.

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