From mboxrd@z Thu Jan  1 00:00:00 1970
From: linux@arm.linux.org.uk (Russell King - ARM Linux)
Date: Wed, 16 Apr 2014 20:53:42 +0100
Subject: [RFC PATCH v4] ARM: uprobes xol write directly to userspace
In-Reply-To: <20140416191825.GA22246@redhat.com>
References: <20140416145107.GA11039@redhat.com>
 <20140416.110031.1269128188581361698.davem@davemloft.net>
 <20140416164310.GA15739@redhat.com>
 <20140416.133831.364304583096073299.davem@davemloft.net>
 <20140416191825.GA22246@redhat.com>
Message-ID: <20140416195342.GH24070@n2100.arm.linux.org.uk>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

On Wed, Apr 16, 2014 at 09:18:25PM +0200, Oleg Nesterov wrote:
> Looks like, __kunmap_atomic()->__cpuc_flush_dcache_area() should take
> care, but could you please ack/nack my understanding?

flush_dcache_area() doesn't touch the I-cache... the hint is in the
name. :)  This is also the function which is used for flush_dcache_page()
which we've already established isn't sufficient (for the same reason.)

Plus... we still would need to know the user address(es) to flush for
the I-cache side...

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