linux-kernel - Re: [PATCH V6 1/3] dma-mapping: Introduce device_is

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Date:   Fri, 22 Sep 2017 15:49:16 +0200
From:   Christoph Hellwig <hch@....de>
To:     Robin Murphy <robin.murphy@....com>
Cc:     陈华才 <chenhc@...ote.com>,
        Christoph Hellwig <hch@....de>,
        Marek Szyprowski <m.szyprowski@...sung.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 1/3] dma-mapping: Introduce device_is_coherent() as
        ahelper

On Fri, Sep 22, 2017 at 02:44:51PM +0100, Robin Murphy wrote:
> Not quite - I mean instead of adding an ops->device_is_coherent callback
> (which cannot really have a safe fallback value either way) and trying
> to enforce that dma_get_cache_alignment() should be the only valid
> caller, just add an ops->get_cache_alignment callback directly.

Exactly - and then fall back to ARCH_DMA_MINALIGN/1 if the ops vector
is not provided, to keep the existing behavior.