linux-kernel - Re: [PATCH] x86 (Linux Tiny): configure out support for some processors

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Date:	Sat, 9 Feb 2008 00:11:31 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Michael Opdenacker <michael-lists@...e-electrons.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Anvin" <hpa@...or.com>, Matt Mackall <mpm@...enic.com>,
	linux-kernel@...r.kernel.org, Linux-tiny@...enic.com
Subject: Re: [PATCH] x86 (Linux Tiny): configure out support for some
	processors


looks good to me, but the patch needs a serious #ifdef removal pass:

* Michael Opdenacker <michael-lists@...e-electrons.com> wrote:

>  	switch (c->x86_vendor) {
> +#ifdef CONFIG_CPU_SUP_AMD
>  	case X86_VENDOR_AMD:
>  		early_init_amd(c);
>  		break;
> +#endif
> +#ifdef CONFIG_CPU_SUP_INTEL
>  	case X86_VENDOR_INTEL:
>  		early_init_intel(c);
>  		break;
> +#endif

would be nice to hide these #ifdefs into include files. (define 
early_init_intel()/etc. as an empty inline in an include file)

> +#ifdef CONFIG_CPU_SUP_INTEL
>  	intel_cpu_init();
> +#endif
> +#ifdef CONFIG_CPU_SUP_CYRIX
>  	cyrix_init_cpu();
> +#endif
> +#ifdef CONFIG_CPU_SUP_NSC
>  	nsc_init_cpu();
> +#endif
> +#ifdef CONFIG_CPU_SUP_AMD
>  	amd_init_cpu();
> +#endif
> +#ifdef CONFIG_CPU_SUP_CENTAUR
>  	centaur_init_cpu();
> +#endif
> +#ifdef CONFIG_CPU_SUP_TRANSMETA
>  	transmeta_init_cpu();
> +#endif
> +#ifdef CONFIG_CPU_SUP_NEXGEN
>  	nexgen_init_cpu();
> +#endif
> +#ifdef CONFIG_CPU_SUP_UMC
>  	umc_init_cpu();
> +#endif

ditto - hide this into cpu.h.

>  static int __cpuinit mwait_usable(const struct cpuinfo_x86 *c)
>  {
> +#ifdef CONFIG_CPU_SUP_AMD
>  	if (force_mwait)
>  		return 1;
> +#endif

same - use cpu.h to define force_mwait to 0 if !CPU_SUP_AMD.

> +#ifdef CONFIG_CPU_SUP_INTEL
>  static inline int page_kills_ppro(unsigned long pagenr)
>  {
>  	if (pagenr >= 0x70000 && pagenr <= 0x7003F)
>  		return 1;
>  	return 0;
>  }
> +#endif

put the #ifdef _inside_ the inline, thus:

> -	if (page_is_ram(pfn) && !(bad_ppro && page_kills_ppro(pfn))) {
> +	if (page_is_ram(pfn)
> +#ifdef CONFIG_CPU_SUP_INTEL
> +	    && !(bad_ppro && page_kills_ppro(pfn))
> +#endif

you can avoid this #ifdef. [handle bad_ppro too]

	Ingo
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