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Date: Wed, 13 Jan 2021 13:44:16 +0100 From: Christoph Hellwig <hch@....de> To: Claire Chang <tientzu@...omium.org> Cc: robh+dt@...nel.org, mpe@...erman.id.au, benh@...nel.crashing.org, paulus@...ba.org, joro@...tes.org, will@...nel.org, frowand.list@...il.com, konrad.wilk@...cle.com, boris.ostrovsky@...cle.com, jgross@...e.com, sstabellini@...nel.org, hch@....de, m.szyprowski@...sung.com, robin.murphy@....com, grant.likely@....com, xypron.glpk@....de, treding@...dia.com, mingo@...nel.org, bauerman@...ux.ibm.com, peterz@...radead.org, gregkh@...uxfoundation.org, saravanak@...gle.com, rafael.j.wysocki@...el.com, heikki.krogerus@...ux.intel.com, andriy.shevchenko@...ux.intel.com, rdunlap@...radead.org, dan.j.williams@...el.com, bgolaszewski@...libre.com, devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org, iommu@...ts.linux-foundation.org, xen-devel@...ts.xenproject.org, tfiga@...omium.org, drinkcat@...omium.org Subject: Re: [RFC PATCH v3 3/6] swiotlb: Use restricted DMA pool if available > +#ifdef CONFIG_SWIOTLB > + if (unlikely(swiotlb_force == SWIOTLB_FORCE) || dev->dma_io_tlb_mem) > return swiotlb_map(dev, phys, size, dir, attrs); > +#endif Please provide a wrapper for the dev->dma_io_tlb_mem check that always returns false if the per-device swiotlb support is not enabled. > index 7fb2ac087d23..1f05af09e61a 100644 > --- a/kernel/dma/swiotlb.c > +++ b/kernel/dma/swiotlb.c > @@ -222,7 +222,6 @@ int __init swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose) > mem->orig_addr[i] = INVALID_PHYS_ADDR; > } > mem->index = 0; > - no_iotlb_memory = false; How does this fit in here?
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