linux-kernel - Re: [RFC 2/6] ipv4: add lockdep condition to fix for_each

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Date:   Mon, 3 Jun 2019 08:28:41 -0400
From:   Joel Fernandes <joel@...lfernandes.org>
To:     Pavel Machek <pavel@...x.de>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Alexey Kuznetsov <kuznet@....inr.ac.ru>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Borislav Petkov <bp@...en8.de>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        "H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
        Josh Triplett <josh@...htriplett.org>,
        Kees Cook <keescook@...omium.org>,
        Kernel Hardening <kernel-hardening@...ts.openwall.com>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        Len Brown <lenb@...nel.org>, linux-acpi@...r.kernel.org,
        linux-pci@...r.kernel.org, Linux PM <linux-pm@...r.kernel.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Neil Brown <neilb@...e.com>, netdev <netdev@...r.kernel.org>,
        Oleg Nesterov <oleg@...hat.com>,
        "Paul E. McKenney" <paulmck@...ux.ibm.com>,
        Peter Zilstra <peterz@...radead.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>, rcu <rcu@...r.kernel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Tejun Heo <tj@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>
Subject: Re: [RFC 2/6] ipv4: add lockdep condition to fix for_each_entry

On Mon, Jun 3, 2019 at 2:42 AM Pavel Machek <pavel@...x.de> wrote:
>
> On Sun 2019-06-02 08:24:35, Joel Fernandes wrote:
> > On Sun, Jun 2, 2019 at 8:20 AM Joel Fernandes <joel@...lfernandes.org> wrote:
> > >
> > > On Sun, Jun 2, 2019 at 3:00 AM Pavel Machek <pavel@...x.de> wrote:
> > > >
> > > > On Sat 2019-06-01 18:27:34, Joel Fernandes (Google) wrote:
> > > > > Signed-off-by: Joel Fernandes (Google) <joel@...lfernandes.org>
> > > >
> > > > This really needs to be merged to previous patch, you can't break
> > > > compilation in middle of series...
> > > >
> > > > Or probably you need hlist_for_each_entry_rcu_lockdep() macro with
> > > > additional argument, and switch users to it.
> > >
> > > Good point. I can also just add a temporary transition macro, and then
> > > remove it in the last patch. That way no new macro is needed.
> >
> > Actually, no. There is no compilation break so I did not follow what
> > you mean. The fourth argument to the hlist_for_each_entry_rcu is
> > optional. The only thing that happens is new lockdep warnings will
> > arise which later parts of the series fix by passing in that fourth
> > argument.
>
> Sorry, I missed that subtlety. Might be worth it enabling the lockdep
> warning last in the series...

Good idea, will do! Thanks.