linux-kernel - Re: [PATCH] isp1760: Flush the D-cache for the pipe-in transfer buffers

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Date:	Tue, 2 Feb 2010 13:08:45 +0100
From:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:	Catalin Marinas <catalin.marinas@....com>
Cc:	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	Greg KH <greg@...ah.com>,
	Matthew Dharm <mdharm-kernel@...-eyed-alien.net>
Subject: Re: [PATCH] isp1760: Flush the D-cache for the pipe-in transfer buffers

* Catalin Marinas | 2010-02-02 11:11:35 [+0000]:

>When the HDC driver writes the data to the transfer buffers it pollutes
>the D-cache (unlike DMA drivers where the device writes the data). If
>the corresponding pages get mapped into user space, there are no
>additional cache flushing operations performed and this causes random
>user space faults on architectures with separate I and D caches
>(Harvard) or those with aliasing D-cache.

After looking through lib/scatterlist.c it uses 
#include <linux/highmem.h>

and 

flush_kernel_dcache_page().
Wouldn't this do the job here as well?

Sebastain
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