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Re: how to increase commandline size (patch + changelog)

From: Marco Gerards
Subject: Re: how to increase commandline size (patch + changelog)
Date: Tue, 10 Oct 2006 08:54:43 +0200
User-agent: Gnus/5.110004 (No Gnus v0.4) Emacs/21.4 (gnu/linux)

Jeff Chua <address@hidden> writes:

> On Mon, 9 Oct 2006, Hollis Blanchard wrote:
>>> Shall I use '#ifdef __linux__' to include <asm/param.h> only on linux, and
>>> '#define COMMAND_LINE_SIZE 255' for non-linux system?
> 5B> Well, does this number change often? If not, let's just copy it.
>> If so, then we're screwed anyways because asm/param.h would only match
>> the installed kernel's limit, so may not work for other kernel versions.
> You're right. asm/param.h determines the limit. We've read this from
> here for linux.
> The idea is that there are users out there who wants to pass quite a
> few parameters during boot, and loadlin currently handles this. I'm
> passing network address, netmask, broadcast, hostname, modules_to_load
> and boot the system up using ramdisk. This allow every system to be
> unique and yet able to boot from the same CDROM/image.
> So, another approach is to use "configure --CommandLineSize=1024" to
> specify the size, but I thought reading from asm/param.h would be
> easier.

I don't like limits that are introduced at compile time.  It means
that either things break when a kernel with other limits are used.  Or
that users will get binaries with limits (for example, when using a
GRUB 2 package).


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