linux-kernel - Re: [PATCH 3/8] x86/mrst: add more timer options to include Medfield

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Date:	Mon, 17 May 2010 00:51:30 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Jacob Pan <jacob.jun.pan@...ux.intel.com>
cc:	LKML <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...e.hu>,
	Alan Cox <alan@...ux.intel.com>,
	Arjan van de Ven <arjan@...ux.intel.com>
Subject: Re: [PATCH 3/8] x86/mrst: add more timer options to include
 Medfield

On Fri, 14 May 2010, Jacob Pan wrote:
>  
> -/*
> - * the secondary clock in Moorestown can be APBT or LAPIC clock, default to
> - * APBT but cmdline option can also override it.
> - */
>  static void __cpuinit mrst_setup_secondary_clock(void)
>  {
> -	/* restore default lapic clock if disabled by cmdline */
> -	if (disable_apbt_percpu)
> -		return setup_secondary_APIC_clock();
> +	if ((mrst_timer_options == MRST_TIMER_APBT_ONLY))
> +		return apbt_setup_secondary_clock();

  Did you compile this ?

> +	if (cpu_has(&current_cpu_data, X86_FEATURE_ARAT)
> +		||  (mrst_timer_options == MRST_TIMER_LAPIC_APBT)) {
> +		pr_info("using lapic timers for secondary clock\n");
> +		setup_secondary_APIC_clock();
> +		return;
> +	}

  As I said before, this function sucks. The decision logic is just
  obscure. It's not rocket science to make it understandable.

>  	apbt_setup_secondary_clock();
>  }

Thanks,

	tglx
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