linux-kernel - Re: [PATCH 1/6] MIPS: remove cpu_has_64bit_gp_regs and cpu_has_64bit

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Message-ID: <20200325085524.GA28706@sx9>
Date:   Wed, 25 Mar 2020 09:55:24 +0100
From:   Fredrik Noring <noring@...rew.org>
To:     Christoph Hellwig <hch@....de>
Cc:     "Maciej W. Rozycki" <macro@...ux-mips.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/6] MIPS: remove cpu_has_64bit_gp_regs and
 cpu_has_64bit_addresses

> The only use of cpu_has_64bit_addresses is the choice of the ioremap
> code base.  Which ioremap code does the R5900 want to use?  If it
> doesn't match CONFIG_64BIT having a config option for the ioremap
> implementation seems much more sensible, and can be added with the
> R5900 patch set (do you have a link to it?).

I suppose this would be relevant for the n32 ABI, but initially we only
have o32 for the R5900. The (slightly outdated) patch series under review
is available here:

https://lore.kernel.org/linux-mips/cover.1567326213.git.noring@nocrew.org/T/

Regarding cpu_has_64bit_gp_regs: another unusual aspect of the R5900 is
its 128-bit GPRs. :)

Fredrik