linux-kernel - Re: [patch 02/17] get_cycles() : x86 HAVE_GET

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Date:	Thu, 13 Nov 2008 08:15:08 +0100 (CET)
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	akpm@...ux-foundation.org, Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Steven Rostedt <rostedt@...dmis.org>,
	linux-kernel@...r.kernel.org, David Miller <davem@...emloft.net>,
	Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-arch@...r.kernel.org
Subject: Re: [patch 02/17] get_cycles() : x86 HAVE_GET_CYCLES

On Wed, 12 Nov 2008, Mathieu Desnoyers wrote:
> --- linux.trees.git.orig/arch/x86/include/asm/tsc.h	2008-11-12 18:15:25.000000000 -0500
> +++ linux.trees.git/arch/x86/include/asm/tsc.h	2008-11-12 18:15:28.000000000 -0500
> @@ -56,6 +56,18 @@ extern void mark_tsc_unstable(char *reas
>  extern int unsynchronized_tsc(void);
>  int check_tsc_unstable(void);
>  
> +static inline cycles_t get_cycles_rate(void)
> +{
> +	if (check_tsc_unstable())
> +		return 0;
> +	return tsc_khz;
                   ^^^

The comment in Kconfig says:

| get_cycles_rate() : cycle counter rate, in HZ
                                             ^^

So what should it be? Hz or kHz?

Gr{oetje,eeting}s,

						Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
							    -- Linus Torvalds
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