Re: [PATCH v2 01/11] swiotlb-xen: use vmalloc_to_page on vmalloc virt addresses

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

Hi Christoph,

Thanks you for the review.


On Mon, 8 Jun 2020, Christoph Hellwig wrote:
> Well, this isn't just RPi4, but basically any ARM or ARM64 system
> with non-coherent DMA (which is most of them).

Well... yes :-)


> > +   struct page *pg;
> 
> Please spell out page.

OK


> >  
> >     if (hwdev && hwdev->coherent_dma_mask)
> >             dma_mask = hwdev->coherent_dma_mask;
> > @@ -346,9 +347,11 @@ xen_swiotlb_free_coherent(struct device *hwdev, size_t 
> > size, void *vaddr,
> >     /* Convert the size to actually allocated. */
> >     size = 1UL << (order + XEN_PAGE_SHIFT);
> >  
> > +   pg = is_vmalloc_addr(vaddr) ? vmalloc_to_page(vaddr) :
> > +                                 virt_to_page(vaddr);
> 
> Please use plain old if/else to make this more readable.

Sure