linux-kernel - Re: [PATCH] x86: put initial_pg

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Message-ID: <49B55FBB.7090606@zytor.com>
Date:	Mon, 09 Mar 2009 11:28:11 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Yinghai Lu <yinghai@...nel.org>
CC:	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: put initial_pg_tables into .bss -v4

Yinghai Lu wrote:
> 
> it just estimates initial_pg_tables size, and make _end a little bigger (1M), so boot loader could have idea of correct size of vmlinux aka the uncompressed size of in kernel.
> 
> I assume brk patches could estimate the extra size that it needs too.
> 

Yes, and I have made that point several times in this thread already.

I really like the brk interface because it's a clean, general-purpose 
allocator.

We can create a brk segment in vmlinux (and even bound the brk to catch 
overflows, instead of randomly failing) to advertise the presence of the 
brk.

	-hpa

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