linux-kernel - Re: [PATCH 4/7] alpha: provide ioread64 and iowrite64 implementations

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Message-ID: <401cdb64-6fdb-be30-b8bc-bf51c1a35074@deltatee.com>
Date:   Thu, 22 Jun 2017 14:09:55 -0600
From:   Logan Gunthorpe <logang@...tatee.com>
To:     Alan Cox <gnomes@...rguk.ukuu.org.uk>
Cc:     linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        linux-ntb@...glegroups.com, linux-alpha@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-crypto@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Stephen Bates <sbates@...thlin.com>,
        Richard Henderson <rth@...ddle.net>,
        Ivan Kokshaysky <ink@...assic.park.msu.ru>,
        Matt Turner <mattst88@...il.com>
Subject: Re: [PATCH 4/7] alpha: provide ioread64 and iowrite64 implementations

On 6/22/2017 2:08 PM, Alan Cox wrote:
> But this does not do the same thing as an ioread64 with regards to
> atomicity or side effects on the device. The same is true of the other
> hacks. You either have a real 64bit single read/write from MMIO space or
> you don't. You can't fake it.

Yes, I know. But is it not better than having every driver that wants to 
use these functions fake it themselves?

Logan