From mboxrd@z Thu Jan  1 00:00:00 1970
From: arnd@arndb.de (Arnd Bergmann)
Date: Tue, 29 Jul 2014 17:38:22 +0200
Subject: [PATCH 1/3] arm64: spin-table: handle unmapped cpu-release-addrs
In-Reply-To: <1406647824.753.12.camel@deneb.redhat.com>
References: <1406630950-32432-1-git-send-email-ard.biesheuvel@linaro.org>
 <2385684.COvj9k7y2z@wuerfel> <1406647824.753.12.camel@deneb.redhat.com>
Message-ID: <2687834.6RWMF06uIT@wuerfel>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

On Tuesday 29 July 2014 11:30:24 Mark Salter wrote:
> On Tue, 2014-07-29 at 17:20 +0200, Arnd Bergmann wrote:
> > On Tuesday 29 July 2014 11:15:45 Mark Salter wrote:
> > > > -
> > > > -     __flush_dcache_area(release_addr, sizeof(release_addr[0]));
> > > > +     writeq_relaxed(__pa(secondary_holding_pen), release_addr);
> > > > +     __flush_dcache_area(release_addr, sizeof(*release_addr));
> > > 
> > >        __flush_dcache_area((__force void *)release_addr, ... 
> > > 
> > > to avoid sparse warning.
> > > 
> > 
> > I think it would be cleaner to drop the __iomem annotation and use vmap()
> > rather than ioremap(). That requires having a 'struct page' though, which
> > I'm not sure you have.
> > 
> 
> You won't. If you did have a struct page, then __va() would work.

Ah, right. I was thinking of highmem, which has a struct page but no virtual
address. However, on arm64 there is obviously no highmem.

	Arnd