Re: [RFC/RFT PATCH 0/5] mm: ARM nobootmem and few dma_mask fixes

[Santosh Shilimkar]

On Friday 26 July 2013 11:10 AM, Russell King - ARM Linux wrote:
> On Fri, Jul 12, 2013 at 05:48:09PM -0400, Santosh Shilimkar wrote:
>> The series is an attempt to move ARM port to NO_BOOTMEM. As discussed
>> on list NO_BOOTMEM move needed updates to max*pfn meaning to be maximum
>> PFNs but that breaks the dma_mask for few block layer drivers since
>> ARM start of physical memory is not PFN0 unlike most of the architectures.
>> Some more read on it is here:
>> 	http://lwn.net/Articles/543408/
>> 	http://lwn.net/Articles/543424/
>>
>> To address this issue, we introduce generic dma_max_pfn() helper which
>> can be overridden from the architectures.
>> 	
>> Another intention behind move to nobootmem is also to convert ARM to
>> switch to memblock and getting rid of bootmem allocator dependency which
>> don't work for LPAE machines which has physical memory starting beyond
>> 4 GB boundary. It needs changes to core kernel and also a new memblock
>> API. More on this can be found here:
>> 	https://lkml.org/lkml/2013/6/29/77
>>
>> I have been trying to cook up these patches with kind help from Russell
>> and we know series don't solve all the dma_mask bad assumptions. But at
>> least I am hoping that it can get the ball rolling.	
>>
>> Comments/testing help is welcome !!
> 
> As this is related to some of the cleanup of dma_mask which I've been
> doing, I think it may make sense to roll this into one tree.  Any
> objection to that?
> 
> Can we get any acks on this stuff from Jens and Jejb etc - especially
> for the bits which touch block/ and for the scsi bits as these are
> touching other subsystems.  (oddly, linux-scsi wasn't on the original
> mail for this series summary.)
> 
Sorry I missed the scsi lists on the summary patch.

While browsing the code I found another spot in mmc layer which
needs fixing. The patch is at the end of the email with Chris
and linux-mmc cc'ed here.

Regards,
Santosh