lkml.org 
[lkml]   [2019]   [Aug]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v2 01/11] asm-generic: add dma_zone_size
On Tue, Aug 20, 2019 at 04:58:09PM +0200, Nicolas Saenz Julienne wrote:
> Some architectures have platform specific DMA addressing limitations.
> This will allow for hardware description code to provide the constraints
> in a generic manner, so as for arch code to properly setup it's memory
> zones and DMA mask.

I know this just spreads the arm code, but I still kinda hate it.

MAX_DMA_ADDRESS is such an oddly defined concepts. We have the mm
code that uses it to start allocating after the dma zones, but
I think that would better be done using a function returning
1 << max(zone_dma_bits, 32) or so. Then we have about a handful
of drivers using it that all seem rather bogus, and one of which
I think are usable on arm64.

\
 
 \ /
  Last update: 2019-08-26 09:10    [W:0.214 / U:2.360 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site