On Thu, Sep 20, 2018 at 10:44:55AM -0700, Max Filippov wrote: > Hi Christoph, > > On Thu, Sep 20, 2018 at 10:15 AM, Christoph Hellwig <[email protected]> wrote: > > This reverts commit 6137e4166004e2ec383ac05d5ca15831f4668806. > > > > We explicitly clear GFP_HIGHMEM from the allowed dma flags at the beginning > > of the function (and the generic dma_alloc_attr function calling us does the > > same!), so this code just adds dead wood. > > No, not really: dma_alloc_from_contiguous does not accept flags (only > no_warn bit) > and may return arbitrary pages. That's the case that this code is handling.
dma_alloc_from_contiguous calls cma_alloc to do the actual allocation, and that uses alloc_contig_range with the GFP_KERNEL flag. How do you end up getting highmem patches from it? _______________________________________________ iommu mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/iommu
