linux-kernel - Re: [PATCH 2/8] signal: clean up __copy_siginfo_to

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Date:   Sun, 19 Apr 2020 10:03:39 +0200
From:   Christoph Hellwig <hch@....de>
To:     "Eric W. Biederman" <ebiederm@...ssion.com>
Cc:     Christoph Hellwig <hch@....de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Jeremy Kerr <jk@...abs.org>, Arnd Bergmann <arnd@...db.de>,
        linuxppc-dev@...ts.ozlabs.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, x86@...nel.org
Subject: Re: [PATCH 2/8] signal: clean up __copy_siginfo_to_user32

On Fri, Apr 17, 2020 at 04:08:23PM -0500, Eric W. Biederman wrote:
> This bothers me because it makes all architectures pay for the sins of
> x32.  Further it starts burying the details of the what is happening in
> architecture specific helpers.  Hiding the fact that there is only
> one niche architecture that does anything weird.
> 
> I am very sensitive to hiding away signal handling details right now
> because way to much of the signal handling code got hidden in
> architecture specific files and was quite buggy because as a result.

I much prefer the unconditional flags over the crazy ifdef mess in
the current coe and your version.  Except for that and the rather
strange and confusing copy_siginfo_to_external32 name it pretty much
looks the same.