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

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Message-ID: <3f9a31f40901020710h508bbfbch3d7ccd6f4898ea03@mail.gmail.com>
Date:	Fri, 2 Jan 2009 20:40:16 +0530
From:	"Jaswinder Singh Rajput" <jaswinderlinux@...il.com>
To:	"Ingo Molnar" <mingo@...e.hu>
Cc:	"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

On Fri, Jan 2, 2009 at 3:08 PM, Ingo Molnar <mingo@...e.hu> wrote:
>
> * Jaswinder Singh Rajput <jaswinderlinux@...il.com> wrote:
>>
>> I think EMBEDDED is a misnomer for using CONFIG_PROCESSOR_SELECT and
>> should be used for more specific to Embedded stuff like for Embedded
>> range of CPUs or Embedded Systems.
>
> i think EMBEDDED is justified in this particular case, as enabling
> CONFIG_PROCESSOR_SELECT allows you to create truly CPU-incompatible
> kernels. Kernels that panic on bootup on contemporary CPUs that happen to
> have a different manufacturer.
>

EMBEDDED leads to following options :
Configure standard kernel features (for small systems)
[*]   Enable 16-bit UID system calls (NEW)
[*]   Sysctl syscall support (NEW)
[*]   Load all symbols for debugging/ksymoops (NEW)
[*]     Include all symbols in kallsyms
[*]       Strip machine generated symbols from kallsyms
[*]     Do an extra kallsyms pass
[*]   Support for hot-pluggable devices (NEW)
[*]   Enable support for printk (NEW)

and these are perfect options for Embedded.

But selection of the PROCESSOR based on EMBEDDED is not a good logic.

CONFIG_PROCESSOR_SELECT should be an independent and by default should
select all related CPUs but user can specify its own CPU if he wants.

If I know what is my CPU there is no point for supporting all related
CPUs in my kernel.

This needs to be fixed.

Thank you,

JSR.
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