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Date:   Tue, 29 Jan 2019 17:01:30 +0100
From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     Vladimir Kondratiev <vladimir.kondratiev@linux.intel.com>
Cc:     Linus Torvalds <torvalds@linux-foundation.org>,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH] lib: 64bit IO
Message-ID: <20190129160130.GA19439@kroah.com>
References: <20190129154102.17655-1-vladimir.kondratiev@linux.intel.com>
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On Tue, Jan 29, 2019 at 05:41:02PM +0200, Vladimir Kondratiev wrote:
> implement missing io{read|write}64
> 
> For 64-bit platforms, these 64-bit io functions are defined in
> include/asm-generic/iomap.h,
> but actual implementation missing. Provide it.

What is in include/asm-generic/io.h?

$ git grep iowrite64be | grep generic
include/asm-generic/io.h:#ifndef iowrite64be
include/asm-generic/io.h:#define iowrite64be iowrite64be
include/asm-generic/io.h:static inline void iowrite64be(u64 value, volatile void __iomem *addr)
include/asm-generic/iomap.h:extern void iowrite64be(u64, void __iomem *);

so are you sure this is needed?

What code is failing to build for you?

thanks,

greg k-h