linux-kernel - Re: [PATCH] fixup! signal: factor copy_siginfo_to_external32 from copy_siginfo_to

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Date:   Wed, 29 Apr 2020 10:07:11 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Christoph Hellwig <hch@....de>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Jeremy Kerr <jk@...abs.org>,
        "Eric W . Biederman" <ebiederm@...ssion.com>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        Linux FS-devel Mailing List <linux-fsdevel@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] fixup! signal: factor copy_siginfo_to_external32 from copy_siginfo_to_user32

On Wed, Apr 29, 2020 at 8:45 AM Christoph Hellwig <hch@....de> wrote:
>
> On Tue, Apr 28, 2020 at 09:56:26PM +0200, Arnd Bergmann wrote:
> > I think I found a way to improve the x32 handling:
> >
> > This is a simplification over Christoph's "[PATCH 2/7] signal: factor
> > copy_siginfo_to_external32 from copy_siginfo_to_user32", reducing the
> > x32 specifics in the common code to a single #ifdef/#endif check, in
> > order to keep it more readable for everyone else.
> >
> > Christoph, if you like it, please fold into your patch.
>
> What do you think of this version?  This one always overrides
> copy_siginfo_to_user32 for the x86 compat case to keep the churn down,
> and improves the copy_siginfo_to_external32 documentation a bit.

Looks good to me. I preferred checking for X32 explicitly (so we can
find and kill off the #ifdef if we ever remove X32 for good), but there is
little difference in the end.

         Arnd