From mboxrd@z Thu Jan  1 00:00:00 1970
From: will.deacon@arm.com (Will Deacon)
Date: Wed, 18 Jun 2014 11:40:09 +0100
Subject: [PATCH] ARM: save/restore diagnostic register on ARMv7
 suspend/resume
In-Reply-To: <1403081398-32116-1-git-send-email-shawn.guo@freescale.com>
References: <1403081398-32116-1-git-send-email-shawn.guo@freescale.com>
Message-ID: <20140618104009.GH32699@arm.com>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

On Wed, Jun 18, 2014 at 09:49:58AM +0100, Shawn Guo wrote:
> The CP15 diagnostic register holds ARM errata bits on ARMv7, so it
> needs to be saved/restored on suspend/resume.  Otherwise, the
> effectiveness of errata workaround gets lost together with diagnostic
> register bit across suspend/resume cycle.

This should be conditional on Cortex-A9, since this register is certainly
not architected.

Will