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Subject: Re: [PATCH] local_irq_disable removal
From: Thomas Gleixner <tglx@linutronix.de>
Reply-To: tglx@linutronix.de
To: Daniel Walker <dwalker@mvista.com>
Cc: Ingo Molnar <mingo@elte.hu>, Esben Nielsen <simlo@phys.au.dk>,
       linux-kernel@vger.kernel.org, sdietrich@mvista.com
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Organization: linutronix
Date: Sun, 12 Jun 2005 02:01:04 +0200
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On Sat, 2005-06-11 at 16:50 -0700, Daniel Walker wrote:
> > > Interesting .. So "cli" takes 7 cycles , "sti" takes 7 cycles. The current 
> > > method does "lea" which takes 1 cycle, and "or" which takes 1 cycle. I'm 
> > > not sure if there is any function call overhead .. So the soft replacment 
> > > of cli/sti is 70% faster on a per instruction level .. So it's at least 
> > > not any slower .. Does everyone agree on that?
> > 
> > No, because x86 is not the whole universe
> 
> It's only implemented on x86 . 

Interesting POV. 

What's not implemented by you does not exist.

tglx