Subject: Re: [PATCH 3/3] powerpc/dma: Remove ZONE_DMA completely

From: "Aneesh Kumar K.V" <[email-masked]>
Date: Fri, 20 Mar 2015 10:56:43 +0530

Benjamin Herrenschmidt <[email-masked]> writes:

> On Wed, 2015-03-18 at 19:49 +0530, Aneesh Kumar K.V wrote:
>> Why not do it also for DMA32 as below. We call limit_zone_pfn() only
>> for few
>> platforms. They can select ZONE_DMA32. Everywhere else ZONE_DMA32 is
>> same as ZONE_NORMAL ? So instead of having confusing output for
>> show_mem(), we now have
>
> There may be cases where we want ZONE_DMA32, what's confusing ?
>
To see output like below

 Node 0 DMA32: 6*64kB (UM) 566*128kB (UEM) 367*256kB (UM) 185*512kB (UM)59*1024kB (UEM) 11*2048kB (UM) 4*4096kB (UM) 3*8192kB (UEM) 4016*16384kB

 Node 1 DMA32: 42*64kB (UEM) 14*128kB (UEM) 10*256kB (UM) 2*512kB (UM) 6*1024kB (UM) 7*2048kB (UEM) 5*4096kB (UM) 2*8192kB (U) 3644*16384kB (MR) =

 That is to find DMA32 convering more than 4GB range.

 -aneesh