Hi, Christoph, Can I put the declaration in asm/dma-coherence.h?
And, last time you said it is OK to pass a NULL to dma_get_cache_alignment() and cc all driver maintainers. I have do so. Huacai ------------------ Original ------------------ From: "Christoph Hellwig"<h...@lst.de>; Date: Mon, Sep 25, 2017 08:51 PM To: "Huacai Chen"<che...@lemote.com>; Cc: "Christoph Hellwig"<h...@lst.de>; "Marek Szyprowski"<m.szyprow...@samsung.com>; "Robin Murphy"<robin.mur...@arm.com>; "Andrew Morton"<a...@linux-foundation.org>; "Fuxin Zhang"<zhan...@lemote.com>; "linux-kernel"<linux-kernel@vger.kernel.org>; "Ralf Baechle"<r...@linux-mips.org>; "James Hogan"<james.ho...@imgtec.com>; "linux-mips"<linux-m...@linux-mips.org>; "James E . J . Bottomley"<j...@linux.vnet.ibm.com>; "Martin K . Petersen"<martin.peter...@oracle.com>; "linux-scsi"<linux-s...@vger.kernel.org>; "Roland Dreier"<rola...@cisco.com>; "Pawel Osciak"<pa...@osciak.com>; "Kyungmin Park"<kyungmin.p...@samsung.com>; "Michael Chan"<michael.c...@broadcom.com>; "Benjamin Herrenschmidt"<b...@kernel.crashing.org>; "Ivan Mikhaylov"<i...@ru.ibm.com>; "Tariq Toukan"<tar...@mellanox.com>; "Andy Gross"<agr...@codeaurora.org>; "Mark A . Greer"<mgr...@mvista.com>; "Robert Baldyga"<r.bald...@samsung.com>; "stable"<sta...@vger.kernel.org>; Subject: Re: [PATCH V7 1/2] dma-mapping: Rework dma_get_cache_alignment() > index aba7138..e2c5d9e 100644 > --- a/arch/mips/include/asm/dma-mapping.h > +++ b/arch/mips/include/asm/dma-mapping.h > @@ -39,4 +39,6 @@ static inline void arch_setup_dma_ops(struct device *dev, > u64 dma_base, > #endif > } > > +int mips_get_cache_alignment(struct device *dev); All the other mips generic dma helpers are prefixed mips_dma_* so it might make sense to follow that. Also please don't add arch-local helpers to asm/dma-mapping.h - this is a header used by linux/dma-mapping.h and should not contain implementation details if avoidable. > + dma_get_cache_alignment(NULL)) / > mdev->limits.mtt_seg_size; As said before - please don't pass NULL to this function but the proper device, which would be &mdev->pdev->dev in this case for example.
