linux-kernel - Re: [PATCH 1/2] dma-mapping: zero memory returned from dma_alloc

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Date:   Fri, 14 Dec 2018 19:35:09 +0100
From:   Christoph Hellwig <hch@....de>
To:     Sam Ravnborg <sam@...nborg.org>
Cc:     Christoph Hellwig <hch@....de>, iommu@...ts.linux-foundation.org,
        Michal Simek <monstr@...str.eu>,
        Ashutosh Dixit <ashutosh.dixit@...el.com>,
        linux-alpha@...r.kernel.org, linux-snps-arc@...ts.infradead.org,
        linux-c6x-dev@...ux-c6x.org, linux-m68k@...ts.linux-m68k.org,
        openrisc@...ts.librecores.org, linux-parisc@...r.kernel.org,
        linux-s390@...r.kernel.org, sparclinux@...r.kernel.org,
        linux-xtensa@...ux-xtensa.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] dma-mapping: zero memory returned from dma_alloc_*

On Fri, Dec 14, 2018 at 07:10:56PM +0100, Sam Ravnborg wrote:
> Hi Christoph,
> 
> I stumbled upon this one:
> 
> #define __get_dma_pages(gfp_mask, order) \
>                 __get_free_pages((gfp_mask) | GFP_DMA, (order))

This isn't directly related to the dma mapping, but another place
that hides GFP_DMA allocations.  So no need for the treatment,
but we really should kill this obsfucating wrapper..