On Thu, Oct 29, 2020 at 12:10 AM Hillf Danton <hdan...@sina.com> wrote: > On Thu, 29 Oct 2020 00:16:24 +0000 John Stultz wrote: > > @@ -194,6 +210,9 @@ static int system_heap_mmap(struct dma_buf *dmabuf, > > struct vm_area_struct *vma) > > struct sg_page_iter piter; > > int ret; > > > > + if (buffer->uncached) > > + vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot); > > + > > Wonder why you turn back to dma_mmap_wc() and friends?
Sorry, can you expand on what you are proposing here instead? I'm not sure I see how dma_alloc/mmap/*_wc() quite fits here. thanks -john
