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Date:   Mon, 24 Feb 2020 18:33:12 +0200
From:   Leon Romanovsky <leon@kernel.org>
To:     Greg KH <gregkh@linuxfoundation.org>
Cc:     Geert Uytterhoeven <geert@linux-m68k.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        David Miller <davem@davemloft.net>,
        Doug Ledford <dledford@redhat.com>,
        Ira Weiny <ira.weiny@intel.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Network Development <netdev@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [GIT] Networking
Message-ID: <20200224163312.GC4526@unreal>
References: <20150624.063911.1220157256743743341.davem@davemloft.net>
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 <CAMuHMdViacgi1W8acma7GhWaaVj92z6pg-g7ByvYOQL-DToacA@mail.gmail.com>
 <20200224124732.GA694161@kroah.com>
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On Mon, Feb 24, 2020 at 01:47:32PM +0100, Greg KH wrote:
> On Mon, Feb 24, 2020 at 11:01:09AM +0100, Geert Uytterhoeven wrote:
> > Hi Linus,
> >
> > On Thu, Jun 25, 2015 at 1:38 AM Linus Torvalds
> > <torvalds@linux-foundation.org> wrote:
> > > On Wed, Jun 24, 2015 at 6:39 AM, David Miller <davem@davemloft.net> wrote:
> > > >   git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git master
> > >
> > > On the *other* side of the same conflict, I find an even more
> > > offensive commit, namely commit 4cd7c9479aff ("IB/mad: Add support for
> > > additional MAD info to/from drivers") which adds a BUG_ON() for a
> > > sanity check, rather than just returning -EINVAL or something sane
> > > like that.
> > >
> > > I'm getting *real* tired of that BUG_ON() shit. I realize that
> > > infiniband is a niche market, and those "commercial grade" niche
> > > markets are more-than-used-to crap code and horrible hacks, but this
> > > is still the kernel. We don't add random machine-killing debug checks
> > > when it is *so* simple to just do
> > >
> > >         if (WARN_ON_ONCE(..))
> > >                 return -EINVAL;
> > >
> > > instead.
> >
> > And if we follow that advice, friendly Greg will respond with:
> > "We really do not want WARN_ON() anywhere, as that causes systems with
> >  panic-on-warn to reboot."
> > https://lore.kernel.org/lkml/20191121135743.GA552517@kroah.com/
>
> Yes, we should not have any WARN_ON calls for something that userspace
> can trigger, because then syzbot will trigger it and we will get an
> annoying report saying to fix it :)

Impressive backlog :)
Geert, you replied on original discussion from 2015.

Thanks

>
> thanks,
>
> greg k-h