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Date: Tue, 06 Oct 2015 14:43:36 +1100 From: Michael Ellerman <mpe@...erman.id.au> To: Nishanth Aravamudan <nacc@...ux.vnet.ibm.com> Cc: Matthew Wilcox <willy@...ux.intel.com>, Keith Busch <keith.busch@...el.com>, Benjamin Herrenschmidt <benh@...nel.crashing.org>, Paul Mackerras <paulus@...ba.org>, Alexey Kardashevskiy <aik@...abs.ru>, David Gibson <david@...son.dropbear.id.au>, Christoph Hellwig <hch@...radead.org>, linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org, Arnd Bergmann <arnd@...db.de> Subject: Re: [PATCH 1/5 v2] dma-mapping: add generic dma_get_page_shift API On Fri, 2015-10-02 at 13:11 -0700, Nishanth Aravamudan wrote: > Drivers like NVMe need to be able to determine the page size used for > DMA transfers. Add a new API that defaults to return PAGE_SHIFT on all > architectures. > > Signed-off-by: Nishanth Aravamudan <nacc@...ux.vnet.ibm.com> > > diff --git a/include/asm-generic/dma-mapping-common.h b/include/asm-generic/dma-mapping-common.h > index b1bc954..86e4e97 100644 > --- a/include/asm-generic/dma-mapping-common.h > +++ b/include/asm-generic/dma-mapping-common.h > @@ -355,4 +355,11 @@ static inline int dma_set_mask(struct device *dev, u64 mask) > } > #endif > > +#ifndef HAVE_ARCH_DMA_GET_PAGE_SHIFT > +static inline unsigned long dma_get_page_shift(struct device *dev) > +{ > + return PAGE_SHIFT; > +} > +#endif > + > #endif > Adding Arnd who is asm-generic maintainer. Arnd/Christoph can one of you give us an ack for this patch? cheers -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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