[RFC 0/4] Intermix Lowmem and vmalloc

[Laura Abbott]

On 11/11/2013 4:13 PM, Russell King - ARM Linux wrote:
> On Mon, Nov 11, 2013 at 03:26:48PM -0800, Laura Abbott wrote:
>> Hi,
>>
>> This is an RFC for a feature to allow lowmem and vmalloc virtual address space
>> to be intermixed. This has currently only been tested on a narrow set of ARM
>> chips.
>>
>> Currently on 32-bit systems we have
>>
>>
>>                    Virtual                             Physical
>>
>>     PAGE_OFFSET   +--------------+     PHYS_OFFSET   +------------+
>>                   |              |                   |            |
>>                   |              |                   |            |
>>                   |              |                   |            |
>>                   | lowmem       |                   |  direct    |
>>                   |              |                   |   mapped   |
>>                   |              |                   |            |
>>                   |              |                   |            |
>>                   |              |                   |            |
>>                   +--------------+------------------>x------------>
>>                   |              |                   |            |
>>                   |              |                   |            |
>>                   |              |                   |  not-direct|
>>                   |              |                   | mapped     |
>>                   | vmalloc      |                   |            |
>>                   |              |                   |            |
>>                   |              |                   |            |
>>                   |              |                   |            |
>>                   +--------------+                   +------------+
>>
>> Where part of the virtual spaced above PHYS_OFFSET is reserved for direct
>> mapped lowmem and part of the virtual address space is reserved for vmalloc.
>
> Minor nit...
>
> ITYM PAGE_OFFSET here.  vmalloc space doesn't exist in physical memory.
>

Yes, that is a typo.

Thanks,
Laura

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