linux-kernel - Re: [PATCH 1/1] i386: Geode's TSC is not neccessary to mark tu unstable

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Message-Id: <20070718180223.e1dad55d.akpm@linux-foundation.org>
Date:	Wed, 18 Jul 2007 18:02:23 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Juergen Beisert <juergen127@...uzholzen.de>
Cc:	TAKADA Yoshihito <takada@....nifty.com>,
	linux-kernel@...r.kernel.org,
	Jordan Crouse <jordan.crouse@....com>,
	Andres Salomon <dilinger@...ian.org>, Andi Kleen <ak@...e.de>,
	Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: [PATCH 1/1] i386: Geode's TSC is not neccessary to mark tu
 unstable

On Sun, 15 Jul 2007 21:06:27 +0200
Juergen Beisert <juergen127@...uzholzen.de> wrote:

> Replace NSC/Cyrix specific chipset access macros by inlined functions.
> With the macros a line like this fails (and does nothing):
> 	setCx86(CX86_CCR2, getCx86(CX86_CCR2) | 0x88);
> With inlined functions this line will work as expected.

I don't get it.  Why would the macros behave differently from inlined
functions?

diff -puN /dev/null include/asm-i386/processor-cyrix.h
> --- /dev/null
> +++ a/include/asm-i386/processor-cyrix.h
> @@ -0,0 +1,20 @@
> +#ifndef __ASM_I386_PROCESSOR_CYRIX_H
> +#define __ASM_I386_PROCESSOR_CYRIX
> +
> +#include <asm/processor-flags.h>
> +/*
> + * NSC/Cyrix CPU indexed register access
> + */
> +static inline u8 getCx86(u8 reg)
> +{
> +	outb(reg, 0x22);
> +	return inb(0x23);
> +}
> +
> +static inline void setCx86(u8 reg, u8 data)
> +{
> +	outb(reg, 0x22);
> +	outb(data, 0x23);
> +}
> +
> +#endif
> diff -puN include/asm-i386/processor.h~i386-geodes-tsc-is-not-neccessary-to-mark-tu-unstable include/asm-i386/processor.h
> --- a/include/asm-i386/processor.h~i386-geodes-tsc-is-not-neccessary-to-mark-tu-unstable
> +++ a/include/asm-i386/processor.h
> @@ -168,17 +168,6 @@ static inline void clear_in_cr4 (unsigne
>  	write_cr4(cr4);
>  }
>  
> -/*
> - *      NSC/Cyrix CPU indexed register access macros
> - */
> -
> -#define getCx86(reg) ({ outb((reg), 0x22); inb(0x23); })
> -
> -#define setCx86(reg, data) do { \
> -	outb((reg), 0x22); \
> -	outb((data), 0x23); \
> -} while (0)
> -
>  /* Stop speculative execution */
>  static inline void sync_core(void)
>  {
> diff -puN include/asm-x86_64/processor.h~i386-geodes-tsc-is-not-neccessary-to-mark-tu-unstable include/asm-x86_64/processor.h
> --- a/include/asm-x86_64/processor.h~i386-geodes-tsc-is-not-neccessary-to-mark-tu-unstable
> +++ a/include/asm-x86_64/processor.h
> @@ -389,17 +389,6 @@ static inline void prefetchw(void *x) 
>  
>  #define cpu_relax()   rep_nop()
>  
> -/*
> - *      NSC/Cyrix CPU indexed register access macros
> - */
> -
> -#define getCx86(reg) ({ outb((reg), 0x22); inb(0x23); })
> -
> -#define setCx86(reg, data) do { \
> -	outb((reg), 0x22); \
> -	outb((data), 0x23); \
> -} while (0)
> -
>  static inline void serialize_cpu(void)
>  {
>  	__asm__ __volatile__ ("cpuid" : : : "ax", "bx", "cx", "dx");
>

-
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