linux-kernel - Re: [PATCH V6 2/3] dma-mapping: Rework dma_get_cache

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Message-ID: <20170921143627.GA18424@lst.de>
Date:   Thu, 21 Sep 2017 16:36:27 +0200
From:   Christoph Hellwig <hch@....de>
To:     陈华才 <chenhc@...ote.com>
Cc:     Christoph Hellwig <hch@....de>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Robin Murphy <robin.murphy@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Fuxin Zhang <zhangfx@...ote.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        "James E . J . Bottomley" <jejb@...ux.vnet.ibm.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        linux-scsi <linux-scsi@...r.kernel.org>,
        stable <stable@...r.kernel.org>
Subject: Re: [PATCH V6 2/3] dma-mapping: Rework
        dma_get_cache_alignment()function

On Thu, Sep 21, 2017 at 12:28:25PM +0800, 陈华才 wrote:
> Hi, Christoph,
> 
> I have changed dma_get_cache_alignment's return value, and I don't know whether those drivers want to return ARCH_DMA_MINALIGN unconditionally. So I pass a NULL for those drivers, in order to keep their old behavior.

Per our documentation yes, they do want ARCH_DMA_MINALIGN.  Please
Cc all the driver maintainers on your updated patch so that they can
review it, though.