linux-kernel - Re: x86: memtest bootparam

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Date:	Fri, 18 Apr 2008 14:52:02 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Yinghai Lu <yhlu.kernel.send@...il.com>,
	Ingo Molnar <mingo@...e.hu>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: x86: memtest bootparam

On Fri, 18 Apr 2008 17:17:44 GMT
Linux Kernel Mailing List <linux-kernel@...r.kernel.org> wrote:

> Gitweb:     http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=c64df70793a9c344874eb4af19f85e0662d2d3ee
> Commit:     c64df70793a9c344874eb4af19f85e0662d2d3ee
> Parent:     9b967106da0357ef8b08847dce35584a04134f20
> Author:     Yinghai Lu <yhlu.kernel.send@...il.com>
> AuthorDate: Fri Mar 21 18:56:19 2008 -0700
> Committer:  Ingo Molnar <mingo@...e.hu>
> CommitDate: Thu Apr 17 17:41:21 2008 +0200
> 
>     x86: memtest bootparam
>     
> ...
>
>  
> +	memtest=	[KNL,X86_64] Enable memtest
> +			Format: <integer>
> +			range: 0,4 : pattern number
> +			default : 0 <disable>

OK.  Did the new memtest feature get documented anywhere, btw?  I'm only
vaguely aware of its existence.

>  
> +config MEMTEST_BOOTPARAM
> +	bool "Memtest boot parameter"
> +	depends on X86_64
> +	default y
> +	help
> +	  This option adds a kernel parameter 'memtest', which allows memtest
> +	  to be disabled at boot.  If this option is selected, memtest
> +	  functionality can be disabled with memtest=0 on the kernel
> +	  command line.  The purpose of this option is to allow a single
> +	  kernel image to be distributed with memtest built in, but not
> +	  necessarily enabled.
> +
> +	  If you are unsure how to answer this question, answer Y.
> +
> +config MEMTEST_BOOTPARAM_VALUE
> +	int "Memtest boot parameter default value (0-4)"
> +	depends on MEMTEST_BOOTPARAM
> +	range 0 4
> +	default 0
> +	help
> +	  This option sets the default value for the kernel parameter
> +	  'memtest', which allows memtest to be disabled at boot.  If this
> +	  option is set to 0 (zero), the memtest kernel parameter will
> +	  default to 0, disabling memtest at bootup.  If this option is
> +	  set to 4, the memtest kernel parameter will default to 4,
> +	  enabling memtest at bootup, and use that as pattern number.
> +
> +	  If you are unsure how to answer this question, answer 0.

These seem pointless.  Why not just unconditionally implement memtest=? 
All the code for that should be __init anyway so we're hardly saving
anything here.


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