linux-kernel - Re: [PATCH] OMAP: iommu flush page table entries from L1 and L2 cache

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Message-ID: <20110414223036.GA7335@n2100.arm.linux.org.uk>
Date:	Thu, 14 Apr 2011 23:30:36 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Fernando Guzman Lugo <fernando.lugo@...com>
Cc:	linux-omap@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, tony@...mide.com,
	Ramesh Gupta <grgupta@...com>,
	Hari Kanigeri <h-kanigeri2@...com>
Subject: Re: [PATCH] OMAP: iommu flush page table entries from L1 and L2
	cache

On Thu, Apr 14, 2011 at 04:52:48PM -0500, Fernando Guzman Lugo wrote:
> From: Ramesh Gupta <grgupta@...com>
> 
> This patch is to flush the iommu page table entries from L1 and L2
> caches using dma_map_single. This also simplifies the implementation
> by removing the functions  flush_iopgd_range/flush_iopte_range.

No.  This usage is just wrong.  If you're going to use the DMA API then
unmap it, otherwise the DMA API debugging will go awol.
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