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

From	Richard Henderson <rth@twiddle.net>
Newsgroups	linux.kernel
Subject	Re: [PATCH 4/7] alpha: provide ioread64 and iowrite64 implementations
Date	2017-06-22 23:30 +0200
Message-ID	<tVhPP-1Gi-1@gated-at.bofh.it> (permalink)
References	<tVdsS-7hT-17@gated-at.bofh.it> <tVdCA-7lD-69@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On 06/22/2017 09:48 AM, Logan Gunthorpe wrote:
> Alpha implements its own io operation and doesn't use the
> common library. Thus to make ioread64 and iowrite64 globally
> available we need to add implementations for alpha.
> 
> For this, we simply use calls that chain two 32-bit operations.
> (mostly because I don't really understand the alpha architecture.)

It's not difficult to provide this interface[*].  I believe the only reason I 
didn't do so from the beginning is that it wasn't used.

r~

* At least for systems other than Jensen, which cannot generate 64-bit I/O.  On 
the other hand, Jensen doesn't have PCI (EISA only), and so won't have any 
devices that care.

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[PATCH 4/7] alpha: provide ioread64 and iowrite64 implementations Logan Gunthorpe <logang@deltatee.com> - 2017-06-22 19:00 +0200
  Re: [PATCH 4/7] alpha: provide ioread64 and iowrite64 implementations "Stephen  Bates" <sbates@raithlin.com> - 2017-06-22 19:30 +0200
    Re: [PATCH 4/7] alpha: provide ioread64 and iowrite64 implementations Logan Gunthorpe <logang@deltatee.com> - 2017-06-22 19:40 +0200
  Re: [PATCH 4/7] alpha: provide ioread64 and iowrite64  implementations Alan Cox <gnomes@lxorguk.ukuu.org.uk> - 2017-06-22 22:10 +0200
    Re: [PATCH 4/7] alpha: provide ioread64 and iowrite64 implementations Logan Gunthorpe <logang@deltatee.com> - 2017-06-22 22:20 +0200
      Re: [PATCH 4/7] alpha: provide ioread64 and iowrite64 implementations Arnd Bergmann <arnd@arndb.de> - 2017-06-22 23:10 +0200
        Re: [PATCH 4/7] alpha: provide ioread64 and iowrite64 implementations Logan Gunthorpe <logang@deltatee.com> - 2017-06-22 23:20 +0200
  Re: [PATCH 4/7] alpha: provide ioread64 and iowrite64 implementations Richard Henderson <rth@twiddle.net> - 2017-06-22 23:30 +0200

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