From: Russell King <rmk@arm.linux.org.uk>
To: Imre Deak <imre.deak@nokia.com>
Cc: Paul Mundt <lethal@linux-sh.org>,
linux-arch@vger.kernel.org,
"Doyu Hiroshi (Nokia-D/Helsinki)" <hiroshi.doyu@nokia.com>,
"vikram.pandita@ti.com" <vikram.pandita@ti.com>,
"tony@atomide.com" <tony@atomide.com>,
"rak@arm.linux.org.uk" <rak@arm.linux.org.uk>,
"rhishi@ti.com" <rhishi@ti.com>,
"r-woodruff2@ti.com" <r-woodruff2@ti.com>,
"laurent.pinchart@ideasonboard.com"
<laurent.pinchart@ideasonboard.com>,
"Syrjala Ville (Nokia-D/Helsinki)" <ville.syrjala@nokia.com>
Subject: Re: DMA from user space buffer/VIPT cache flushing wows (was: Minutes: 21 Sept,09 RMK meeting)
Date: Wed, 11 Nov 2009 19:29:45 +0000 [thread overview]
Message-ID: <20091111192945.GA31608@flint.arm.linux.org.uk> (raw)
In-Reply-To: <20091110160334.GE734@localhost>
On Tue, Nov 10, 2009 at 06:03:34PM +0200, Imre Deak wrote:
> Additionally as I said we would need a kernel interface for flushing
> user space buffers and mlock is not exposed to drivers. For that we
> would also need to add reference counting for mlock.
Oh, and let me re-iterate: the purpose of the patch I supplied to Texas
was to solve _their_ specific problem, which is to get the DSP bridge
driver working.
It is *not* a generic interface for kernel drivers to use. That's why
I ignored your comment about kernel interfaces for flusing userspace
buffers. It's just not relevant to the problem at hand.
--
Russell King
Linux kernel 2.6 ARM Linux - http://www.arm.linux.org.uk/
maintainer of:
next prev parent reply other threads:[~2009-11-11 19:29 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20091027163551.GA1446@flint.arm.linux.org.uk>
[not found] ` <20091028.143432.241464826.Hiroshi.DOYU@nokia.com>
[not found] ` <20091028174920.GA20945@flint.arm.linux.org.uk>
[not found] ` <20091029.151251.45877478.Hiroshi.DOYU@nokia.com>
[not found] ` <20091029133703.GA3860@flint.arm.linux.org.uk>
[not found] ` <20091106151558.GA7986@localhost>
[not found] ` <20091108184753.GA31433@flint.arm.linux.org.uk>
[not found] ` <20091109001509.GB28928@localhost>
[not found] ` <20091109101056.GA29621@flint.arm.linux.org.uk>
2009-11-10 16:03 ` DMA from user space buffer/VIPT cache flushing wows (was: Minutes: 21 Sept,09 RMK meeting) Imre Deak
2009-11-11 19:26 ` Russell King
2009-11-11 19:29 ` Russell King [this message]
2009-11-11 19:50 ` Woodruff, Richard
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