From mboxrd@z Thu Jan  1 00:00:00 1970
From: linux@arm.linux.org.uk (Russell King - ARM Linux)
Date: Wed, 13 Jun 2012 10:36:34 +0100
Subject: [RFC/PATCH v5 5/7] ARM: ARM11 MPCore: cpu_v6_dcache_clean_area
 needs RFO
In-Reply-To: <20120613093218.GC29492@arm.com>
References: <1318945654-548-1-git-send-email-gdavis@mvista.com>
 <1339533618-15969-1-git-send-email-gdavis@mvista.com>
 <1339533618-15969-6-git-send-email-gdavis@mvista.com>
 <20120613093218.GC29492@arm.com>
Message-ID: <20120613093634.GA31722@n2100.arm.linux.org.uk>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

On Wed, Jun 13, 2012 at 10:32:18AM +0100, Catalin Marinas wrote:
> Alternatively, we could disable the interrupts around RFO and D-cache
> cleaning (inside the loop), though I think the preempt disabling is
> faster.

It also has the *important* effect that it doesn't cause problems with
interrupt latency, which is a real concern if you have peripherals
requiring quick servicing.