linux-kernel - Re: [PATCH 1/2] boot: increase stack size for kernel boot loader decompressor

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Message-ID: <20080405134626.GA15894@mailshack.com>
Date:	Sat, 5 Apr 2008 15:46:26 +0200
From:	Alexander van Heukelum <heukelum@...lshack.com>
To:	Mike Travis <travis@....com>
Cc:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] boot: increase stack size for kernel boot loader decompressor

On Fri, Apr 04, 2008 at 06:30:15PM -0700, Mike Travis wrote:
>   * Increase stack size for the kernel bootloader decompressor.  This is
>     needed to boot a kernel with NR_CPUS = 4096.  I tested with 8k stack
>     size but that wasn't sufficient.
> 
> Based on:
> 	git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git
>     +   x86/latest          .../x86/linux-2.6-x86.git
>     +   sched-devel/latest  .../mingo/linux-2.6-sched-devel.git
> 
> Signed-off-by: Mike Travis <travis@....com>
> ---
>  arch/x86/boot/compressed/head_64.S |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> --- linux-2.6.25-rc5.orig/arch/x86/boot/compressed/head_64.S
> +++ linux-2.6.25-rc5/arch/x86/boot/compressed/head_64.S
> @@ -314,5 +314,5 @@ gdt_end:
>  /* Stack for uncompression */
>  	.balign 4
>  user_stack:
> -	.fill 4096,4,0
> +	.fill 16384,4,0
--------------^^^ * ^

Changed from 16K to 64K. I wonder what is using so much space on
this stack?

>  user_stack_end:
> 
> -- 
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