linux-kernel - Re: PAGE_SIZE on 64bit and 32bit machines

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Message-ID: <20071112161106.GB24243@fattire.cabal.ca>
Date:	Mon, 12 Nov 2007 11:11:06 -0500
From:	Kyle McMartin <kyle@...artin.ca>
To:	Yoav Artzi <yoavar@...ckpoint.com>
Cc:	Adrian Bunk <bunk@...nel.org>, Jiri Slaby <jirislaby@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: PAGE_SIZE on 64bit and 32bit machines

On Mon, Nov 12, 2007 at 05:58:08PM +0200, Yoav Artzi wrote:
> Looking at the source, I see:
> 
> #ifdef CONFIG_4KSTACKS
> #define THREAD_SIZE            (4096)
> #else
> #define THREAD_SIZE        (8192)
> #endif
> 
> 
> So if I configure the option CONFIG_4KSTACK, I will get a 4KB kernel 
> stack. Am I missing something here?
> 

This is only on i386 (32-bit x86...)[1] On x86-64, we have 8K kernel
stacks (THREAD_ORDER 1), and 16K irqstacks (IRQSTACK_ORDER 2).

The relevant defines are found in <asm-x86/page_64.h> for x86_64, and
<asm-x86/thread_info_32.h> for i386.

Cheers,
	Kyle

1. That is, stack size is only configurable on 32bit.
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