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

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Message-ID: <alpine.LFD.2.21.2003250226450.2689954@eddie.linux-mips.org>
Date:   Wed, 25 Mar 2020 02:36:57 +0000 (GMT)
From:   "Maciej W. Rozycki" <macro@...ux-mips.org>
To:     Christoph Hellwig <hch@....de>
cc:     Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Fredrik Noring <noring@...rew.org>, 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

On Tue, 24 Mar 2020, Christoph Hellwig wrote:

> Both macros are always identical to CONFIG_64BIT.

 I think this abstraction makes sense, especially if we want to support 
64-bit CPUs that only support 32-bit segments, i.e. MIPS architecture 
processors whose CP0.Config.AT=1, or legacy MIPS processors that had a 
similar limitation, such as the R5900 currently under review.

  Maciej