From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To: Catalin Marinas <catalin.marinas@arm.com>
Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org,
Greg KH <greg@kroah.com>,
Matthew Dharm <mdharm-kernel@one-eyed-alien.net>
Subject: Re: [PATCH] isp1760: Flush the D-cache for the pipe-in transfer buffers
Date: Tue, 2 Feb 2010 13:08:45 +0100 [thread overview]
Message-ID: <20100202120845.GA7210@www.tglx.de> (raw)
In-Reply-To: <20100202111135.18636.62688.stgit@pc1117.cambridge.arm.com>
* 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
next prev parent reply other threads:[~2010-02-02 12:09 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-02 11:11 Catalin Marinas
2010-02-02 12:08 ` Sebastian Andrzej Siewior [this message]
2010-02-02 15:28 ` Catalin Marinas
2010-02-02 15:41 ` Ming Lei
2010-02-02 15:54 ` Catalin Marinas
2010-02-02 15:54 ` Sebastian Andrzej Siewior
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