linux-kernel - Re: [PATCH v2 01/11] swiotlb-xen: use vmalloc_to

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Message-ID: <alpine.DEB.2.21.2006081539110.2815@sstabellini-ThinkPad-T480s>
Date:   Mon, 8 Jun 2020 15:53:58 -0700 (PDT)
From:   Stefano Stabellini <sstabellini@...nel.org>
To:     Christoph Hellwig <hch@...radead.org>
cc:     Stefano Stabellini <sstabellini@...nel.org>, jgross@...e.com,
        boris.ostrovsky@...cle.com, konrad.wilk@...cle.com,
        xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org,
        tamas@...engyel.com, roman@...eda.com,
        Stefano Stabellini <stefano.stabellini@...inx.com>
Subject: Re: [PATCH v2 01/11] swiotlb-xen: use vmalloc_to_page on vmalloc
 virt addresses

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