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

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Date:   Thu, 22 Jun 2017 15:10:20 -0600
From:   Logan Gunthorpe <logang@...tatee.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Alan Cox <gnomes@...rguk.ukuu.org.uk>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arch <linux-arch@...r.kernel.org>,
        linux-ntb@...glegroups.com, linux-alpha@...r.kernel.org,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        linux-crypto@...r.kernel.org,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        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 3:03 PM, Arnd Bergmann wrote:
> Drivers that want a non-atomic variant should include either
> include/linux/io-64-nonatomic-hi-lo.h or include/linux/io-64-nonatomic-lo-hi.h
> depending on what they need. Drivers that require 64-bit I/O should
> probably just depend on CONFIG_64BIT and maybe use readq/writeq.

Ok, I will work something like that up.

We'll still need a patch similar to patch 2 (less the non-atomic 
versions) seeing even CONFIG_GENERIC_IOMAP arches don't actually have a 
working ioread64/iowrite64 implementation.

Thanks,

Logan