linux-kernel - Re: [RFC] arm: DMA-API contiguous cacheable memory

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Message-ID: <20150519223444.GO2067@n2100.arm.linux.org.uk>
Date:	Tue, 19 May 2015 23:34:44 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	linux-arm-kernel@...ts.infradead.org,
	Lorenzo Nava <lorenx4@...il.com>,
	Catalin Marinas <catalin.marinas@....com>,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC] arm: DMA-API contiguous cacheable memory

On Wed, May 20, 2015 at 12:14:48AM +0200, Arnd Bergmann wrote:
> With that memory, you should be able to use the normal streaming
> API (dma_sync_single_for_*).

Wrong, as I've pointed out previously.  The only memory which you're
allowed to sync is with memory which has been mapped with a dma_map_*()
function.

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