linux-kernel - Re: RISC-V nommu support v2

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Message-ID: <20190624115428.GA9538@lst.de>
Date:   Mon, 24 Jun 2019 13:54:28 +0200
From:   Christoph Hellwig <hch@....de>
To:     Vladimir Murzin <vladimir.murzin@....com>
Cc:     Christoph Hellwig <hch@....de>, Palmer Dabbelt <palmer@...ive.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Damien Le Moal <damien.lemoal@....com>,
        linux-riscv@...ts.infradead.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: RISC-V nommu support v2

On Mon, Jun 24, 2019 at 12:47:07PM +0100, Vladimir Murzin wrote:
> Since you are using binfmt_flat which is kind of 32-bit only I was expecting to see
> CONFIG_COMPAT (or something similar to that, like ILP32) enabled, yet I could not
> find it.

There is no such thing in RISC-V.  I don't know of any 64-bit RISC-V
cpu that can actually run 32-bit RISC-V code, although in theory that
is possible.  There also is nothing like the x86 x32 or mips n32 mode
available either for now.

But it turns out that with a few fixes to binfmt_flat it can run 64-bit
binaries just fine.  I sent that series out a while ago, and IIRC you
actually commented on it.