linux-kernel - Re: [PATCH V8 1/5] dma-mapping: Rework dma_get_cache

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Date:   Thu, 19 Oct 2017 17:09:21 +0200
From:   Christoph Hellwig <hch@....de>
To:     Mark Greer <mgreer@...malcreek.com>
Cc:     Huacai Chen <chenhc@...ote.com>, 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@...r.kernel.org,
        Ralf Baechle <ralf@...ux-mips.org>,
        James Hogan <james.hogan@...tec.com>,
        linux-mips@...ux-mips.org,
        "James E . J . Bottomley" <jejb@...ux.vnet.ibm.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        linux-scsi@...r.kernel.org, Tejun Heo <tj@...nel.org>,
        linux-ide@...r.kernel.org, stable@...r.kernel.org,
        "Michael S . Tsirkin" <mst@...lanox.co.il>,
        Pawel Osciak <pawel@...iak.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Michael Chan <michael.chan@...adcom.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Ivan Mikhaylov <ivan@...ibm.com>,
        Tariq Toukan <tariqt@...lanox.com>,
        Andy Gross <agross@...eaurora.org>,
        Robert Baldyga <r.baldyga@...kerion.com>
Subject: Re: [PATCH V8 1/5] dma-mapping: Rework dma_get_cache_alignment()

On Wed, Oct 18, 2017 at 10:23:36AM -0700, Mark Greer wrote:
> >  #define	MPSC_RXR_ENTRIES	32
> > -#define	MPSC_RXRE_SIZE		dma_get_cache_alignment()
> > +#define	MPSC_RXRE_SIZE		dma_get_cache_alignment(dma_dev)
> 
> I would much prefer that you add a parameter to the macro to avoid forcing
> a non-flexible and non-obvious variable definition wherever it is used.
> What I mean is something like:
> 
> #define MPSC_RXRE_SIZE(d)		dma_get_cache_alignment(d)
> 
> Similarly for all of the other macros and where they're used.

Agreed.  Except for that the patch looks fine to me, though.