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

From: Andi Kleen
Date: Tue Mar 06 2007 - 13:36:03 EST



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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