linux-kernel - Re: [PATCH] x86,mm: fix init_mem_mapping() when the first memory chunk is small

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Message-ID: <CAE9FiQX38v_3-zMebjbUPum+Tt1z1jrDAzAfXo4o1j4X-xbHSg@mail.gmail.com>
Date:	Fri, 8 Mar 2013 11:01:12 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	David Vrabel <david.vrabel@...rix.com>
Cc:	linux-kernel@...r.kernel.org, x86@...nel.org,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] x86,mm: fix init_mem_mapping() when the first memory
 chunk is small

On Fri, Mar 8, 2013 at 10:47 AM, David Vrabel <david.vrabel@...rix.com> wrote:
> In init_mem_mapping(), if the first chunk of memory that is mapped is
> small, there will not be enough mapped pages to allocate page table
> pages for the next (larger) chunk.
>
> Estimate how many pages are used for the mappings so far and how many
> are needed for a larger chunk, and only increase step_size if there
> are enough free pages.
>
> This fixes a boot failure on a system where the first chunk of memory
> mapped only had 3 pages in it.
>
> init_memory_mapping: [mem 0x00000000-0x000fffff]
> init_memory_mapping: [mem 0x20d000000-0x20d002fff]
> init_memory_mapping: [mem 0x20c000000-0x20cffffff]
> Kernel panic - not syncing: alloc_low_page: can not alloc memory

Can you check current linus tree?

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=98e7a989979b185f49e86ddaed2ad6890299d9f0

should fix the problem with your system.

Thanks

Yinghai
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