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

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Message-ID: <20090102162120.GG1180@elte.hu>
Date:	Fri, 2 Jan 2009 17:21:20 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Jaswinder Singh Rajput <jaswinderlinux@...il.com>
Cc:	Valdis.Kletnieks@...edu, Bryan Donlan <bdonlan@...il.com>,
	Ingo Brueckl <ib@...peronline.de>,
	linux-kernel@...r.kernel.org, "H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: x86 (Linux Tiny): configure out support for some processors


* Jaswinder Singh Rajput <jaswinderlinux@...il.com> wrote:

> On Fri, Jan 2, 2009 at 9:09 PM,  <Valdis.Kletnieks@...edu> wrote:
> > On Fri, 02 Jan 2009 20:40:16 +0530, Jaswinder Singh Rajput said:
> >
> >> If I know what is my CPU there is no point for supporting all related
> >> CPUs in my kernel.
> >
> > EMBEDDED is for a large assortment of things, all of which are of the form:
> >
> > General users won't want to change Y, but if I know I don't need Y, there is
> > no point in supporting Y in the kernel.
> >
> 
> On 64 bit AMD machine I was getting :
> [    0.000000] KERNEL supported cpus:
> [    0.000000]   Intel GenuineIntel
> [    0.000000]   AMD AuthenticAMD
> [    0.000000]   Centaur CentaurHauls
> 
> By using the following patch I get rid of extra CPU support and also 
> reduces size of the kernel.

So you want to save kernel size by making less generic kernels tailored to 
a single box [yours in this case] - basically embedding the kernel on it?

> Let me know why should I choose EMBEDDED option ? I know I am not using 
> Embbeded machine and I do not need embbeded features on my machine. 
> [...]

that is what CONFIG_EMBEDDED=y means in broad terms: "make the kernel more 
specific [more embedded] to a particular hw/sw combination".

	Ingo
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