linux-kernel - Re: [PATCH 8/8] Convert PDA into the percpu section

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Message-ID: <20070306193445.GI22829@bingen.suse.de>
Date:	Tue, 6 Mar 2007 20:34:45 +0100
From:	Andi Kleen <ak@...e.de>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	lkml - Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Zachary Amsden <zach@...are.com>,
	Jeremy Fitzhardinge <jeremy@...source.com>,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andi Kleen <ak@...e.de>
Subject: Re: [PATCH 8/8] Convert PDA into the percpu section


Sigh -- i had hoped this had settled down because it was a
merging nightmare last time. Ok. 

> +#define percpu_to_op(op,var,val)				\
> +	do {							\
> +		typedef typeof(var) T__;			\
> +		if (0) { T__ tmp__; tmp__ = (val); }		\
> +		switch (sizeof(var)) {				\
> +		case 1:						\
> +			asm(op "b %1,"__percpu_seg"%0"		\
> +			    : "+m" (var)			\
> +			    :"ri" ((T__)val));			\

Perhaps I'm blind but I can't see where the %fs reference is there.
How does this work? 

Do you have text size comparisons before/after and possible lmbench? 

-Andi
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