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

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Date:	Fri, 8 Mar 2013 19:37:48 +0000
From:	David Vrabel <david.vrabel@...rix.com>
To:	Yinghai Lu <yinghai@...nel.org>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"x86@...nel.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 08/03/13 19:01, Yinghai Lu wrote:
> 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.

Yes, that fixes it thanks.

David
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