linux-kernel - Re: [PATCH net-next v3 0/4] remove compat_alloc_user

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Message-ID: <20201106144616.28d074a6@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date:   Fri, 6 Nov 2020 14:46:16 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     Networking <netdev@...r.kernel.org>, Arnd Bergmann <arnd@...db.de>,
        "David S. Miller" <davem@...emloft.net>,
        Christoph Hellwig <hch@...radead.org>,
        Jiri Pirko <jiri@...lanox.com>,
        Taehee Yoo <ap420073@...il.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Andrew Lunn <andrew@...n.ch>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next v3 0/4] remove compat_alloc_user_space()

On Fri, 6 Nov 2020 22:48:18 +0100 Arnd Bergmann wrote:
> On Fri, Nov 6, 2020 at 6:32 PM Arnd Bergmann <arnd@...nel.org> wrote:
> >
> > From: Arnd Bergmann <arnd@...db.de>
> >
> > This is the third version of my seires, now spanning four patches
> > instead of two, with a new approach for handling struct ifreq
> > compatibility after I realized that my earlier approach introduces
> > additional problems.
> >
> > The idea here is to always push down the compat conversion
> > deeper into the call stack: rather than pretending to be
> > native mode with a modified copy of the original data on
> > the user space stack, have the code that actually works on
> > the data understand the difference between native and compat
> > versions.
> >
> > I have spent a long time looking at all drivers that implement
> > an ndo_do_ioctl callback to verify that my assumptions are
> > correct. This has led to a series of 29 additional patches
> > that I am not including here but will post separately, fixing
> > a number of bugs in SIOCDEVPRIVATE ioctls, removing dead
> > code, and splitting ndo_do_ioctl into two new ndo callbacks
> > for private and ethernet specific commands.  
> 
> I got a reply from the build bots that the version I sent was broken
> on 32-bit machines, so don't merge it just yet. Let me know if
> there are any other comments I should address before resending
> though.

Looks like patch 4 also breaks 64 bit allmodconfig build.

Beyond that - patches 1 and 4 warrant need a second look at:

	checkpatch.pl --strict --min-conf-desc-length=80