linux-kernel - Re: [PATCH] x86: fix numaq_tsc

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Date:	Sun, 13 Jul 2008 08:25:37 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Yinghai Lu <yhlu.kernel@...il.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: fix numaq_tsc_disable calling

* Yinghai Lu <yhlu.kernel@...il.com> wrote:

>  	if (cpu_has_bts)
>  		ptrace_bts_init_intel(c);
> +
> +#ifdef CONFIG_X86_NUMAQ
> +	numaq_tsc_disable();
> +#endif

could you please one more cleanup and hide the CONFIG_X86_NUMAQ in the 
header file, so that we can just call numaq_tsc_disable() without an
#ifdef?

also, that TSC quirk should probably be turned into an explicit quirk 
function pointer initialized by the early-init NUMAQ code and left NULL 
by everything else - like we it on visws. See include/asm-x86/setup.h:

 /*
  * Any setup quirks to be performed?
  */
 extern int (*arch_time_init_quirk)(void);
 extern int (*arch_pre_intr_init_quirk)(void);
 extern int (*arch_intr_init_quirk)(void);
 extern int (*arch_trap_init_quirk)(void);
 extern char * (*arch_memory_setup_quirk)(void);
 extern int (*mach_get_smp_config_quirk)(unsigned int early);
 extern int (*mach_find_smp_config_quirk)(unsigned int reserve);

the goal is to offload all non-standard setup that is not a reasonable 
deviation of some of the major vendors to such a quirk handler. Quirks 
are a lot easier to maintain and a lot easier to think about - they can 
be just by-line functionality to the main body of default behavior.

	Ingo
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