linux-kernel - ensure dma_alloc_coherent always returns zeroed memory

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Date:   Fri, 14 Dec 2018 09:25:13 +0100
From:   Christoph Hellwig <hch@....de>
To:     iommu@...ts.linux-foundation.org
Cc:     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: ensure dma_alloc_coherent always returns zeroed memory

For security reasons we already returned zeroed memory from
dma_alloc_coherent on most common platforms, but some implementation
missed out.  Make sure we provide a consistent behavior.