linux-kernel - Re: [PATCH] x86_64: fix overlap between pagetable with bss section

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Message-ID: <20080129174242.GA26562@elte.hu>
Date:	Tue, 29 Jan 2008 18:42:43 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Yinghai Lu <Yinghai.Lu@....COM>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH] x86_64: fix overlap between pagetable with bss section


* Yinghai Lu <Yinghai.Lu@....COM> wrote:

> [PATCH] x86_64: fix overlap between pagetable with bss section
> 
> one early crash on one 8 node 256g machine

> +++ b/arch/x86/mm/init_64.c
> @@ -358,6 +358,8 @@ static void __init find_early_table_space(unsigned long end)
>  	if (table_start == -1UL)
>  		panic("Cannot find space for the kernel page tables");
>  
> +	/* need to round it up to avoid overlap less one page */
> +	table_start = round_up(table_start, PAGE_SIZE);
>  	table_start >>= PAGE_SHIFT;
>  	table_end = table_start;

thanks, applied.

	Ingo
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