From mboxrd@z Thu Jan  1 00:00:00 1970
From: jszhang@marvell.com (Jisheng Zhang)
Date: Fri, 22 Jul 2016 14:58:56 +0800
Subject: [RFC] arm64: mm: use pgprot_device for device in
 phys_mem_access_prot
In-Reply-To: <20160721160300.GF16666@e104818-lin.cambridge.arm.com>
References: <20160721151344.36e29858@xhacker>
 <20160721160300.GF16666@e104818-lin.cambridge.arm.com>
Message-ID: <20160722145856.61ad9c12@xhacker>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

On Thu, 21 Jul 2016 17:03:00 +0100 Catalin Marinas wrote:

> On Thu, Jul 21, 2016 at 03:13:44PM +0800, Jisheng Zhang wrote:
> > Normally, in arm64, kernel driver maps register space as device nGnRE. But
> > if we access the register space via. /dev/mem, then the mapping is
> > device nGnRnE, is there a mismatch here?  
> 
> Possibly, but the behaviour is not undefined. The nGnRnE may lose the nE
> behaviour (which is a hint anyway, it may not be honoured).

Got it. Thanks for confirmation.