linux-kernel - Re: [PATCH 2/7] iomap: implement ioread64 and iowrite64

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Date:   Mon, 26 Jun 2017 15:25:41 -0600
From:   Logan Gunthorpe <logang@...tatee.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     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>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Suresh Warrier <warrier@...ux.vnet.ibm.com>,
        Nicholas Piggin <npiggin@...il.com>
Subject: Re: [PATCH 2/7] iomap: implement ioread64 and iowrite64

On 6/26/2017 2:43 PM, Arnd Bergmann wrote:
> This hardcodes the behavior of include/linux/io-64-nonatomic-hi-lo.h, which
> I find rather confusing, as only about one in five drivers wants this
> behavior.
>
> I'd suggest you don't add it in lib/iomap.c at all for 32-bit architectures,
> but rather use the same logic that we have for readq/writeq in
> io-64-nonatomic-hi-lo.h and io-64-nonatomic-lo-hi.h, adding
> {lo_hi,hi_lo}_{ioread,iowrite}{,be} to the same files, and provide
> the {ioread,iowrite}{,be} macros only if they have not been defined
> at that point.

Thanks Arnd. Yes, I'm already reworking this patchset to do exactly that.

Logan