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From:   Arnd Bergmann <arnd@arndb.de>
Date:   Fri, 26 Mar 2021 16:02:01 +0100
Message-ID: <CAK8P3a3PeMbrC3v4tGPJb+OpZYXHabe4UcF+TiBWF_JCtnwHkw@mail.gmail.com>
Subject: Re: [PATCH 3/4] exec: simplify the compat syscall handling
To:     Christoph Hellwig <hch@lst.de>
Cc:     "Eric W. Biederman" <ebiederm@xmission.com>,
        Al Viro <viro@zeniv.linux.org.uk>,
        Brian Gerst <brgerst@gmail.com>,
        Luis Chamberlain <mcgrof@kernel.org>,
        Linux ARM <linux-arm-kernel@lists.infradead.org>,
        "the arch/x86 maintainers" <x86@kernel.org>,
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On Fri, Mar 26, 2021 at 3:38 PM Christoph Hellwig <hch@lst.de> wrote:
>
> The only differenence betweeen the compat exec* syscalls and their
> native versions is the compat_ptr sign extension, and the fact that
> the pointer arithmetics for the two dimensional arrays needs to use
> the compat pointer size.  Instead of the compat wrappers and the
> struct user_arg_ptr machinery just use in_compat_syscall() to do the
> right thing for the compat case deep inside get_user_arg_ptr().
>
> Signed-off-by: Christoph Hellwig <hch@lst.de>

Nice cleanup!

Reviewed-by: Arnd Bergmann <arnd@arndb.de>