linux-kernel - Re: [RFC][PATCH] regmap: Drop CONFIG

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Date:   Wed, 26 Jun 2019 13:05:49 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Marek Vasut <marex@...x.de>
Cc:     linux-kernel@...r.kernel.org,
        "Rafael J . Wysocki" <rafael@...nel.org>
Subject: Re: [RFC][PATCH] regmap: Drop CONFIG_64BIT checks from core

On Wed, Jun 26, 2019 at 01:20:17PM +0200, Marek Vasut wrote:
> On 6/26/19 1:15 PM, Mark Brown wrote:

> > registers was that we use unsigned long for
> > addresses and values and a 64 bit value won't fit in those on a 32 bit
> > system.  Some of the bulk APIs will work but things like individual
> > register writes and the caches will have problems.

> Good thing I sent this as RFC, I realized that shortly after too.

> So, what would be the suggestion here ?

I think if I had any really good ideas I'd have done it at the time :/
Converting to unsigned long long is going to hurt performance for the
common case but it'd probably be what we need to do, I think we'd need
to have some sort of preprocessor fun and build two copies of the code
with a 64 bit clean version available for devices that need it which is
ugly but bleh.  It's how we handle similar issues with zlib.

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