[lkml]   [2020]   [Sep]   [30]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: linux-next: build failure after merge of the drm tree
On Wed, Sep 30, 2020 at 06:39:18PM +0200, Paul Cercueil wrote:
>> dma_alloc_pages gives you cached memory, so you can't just use an
>> uncached protection for the userspace mmap here. If you want uncached
>> memory you need to use dma_alloc_coherent paired with dma_mmap_coherent.
>> Or dma_alloc_wc for a slightly different flavor of uncached. (both
>> of the map to dma_alloc_attrs / dma_mmap_attrs eventually).
> I don't want uncached memory, I want non-coherent cached memory.

We don't have such a thing in the Linux API at all.

 \ /
  Last update: 2020-09-30 18:41    [W:0.047 / U:0.836 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site