netdev - Re: [RFC 4/6] workqueue: Convert for_each

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Date:   Wed, 5 Jun 2019 09:04:44 -0400
From:   Joel Fernandes <joel@...lfernandes.org>
To:     Daniel Jordan <daniel.m.jordan@...cle.com>
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>,
        Pavel Machek <pavel@....cz>,
        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 4/6] workqueue: Convert for_each_wq to use built-in list check

On Tue, Jun 4, 2019 at 9:25 PM Daniel Jordan <daniel.m.jordan@...cle.com> wrote:
>
> On Sat, Jun 01, 2019 at 06:27:36PM -0400, Joel Fernandes (Google) wrote:
> > list_for_each_entry_rcu now has support to check for RCU reader sections
> > as well as lock. Just use the support in it, instead of explictly
> > checking in the caller.
> >
> > Signed-off-by: Joel Fernandes (Google) <joel@...lfernandes.org>
> > ---
> >  kernel/workqueue.c | 5 ++---
> >  1 file changed, 2 insertions(+), 3 deletions(-)
> >
> > diff --git a/kernel/workqueue.c b/kernel/workqueue.c
> > index 9657315405de..91ed7aca16e5 100644
> > --- a/kernel/workqueue.c
> > +++ b/kernel/workqueue.c
> > @@ -424,9 +424,8 @@ static void workqueue_sysfs_unregister(struct workqueue_struct *wq);
> >   * ignored.
> >   */
> >  #define for_each_pwq(pwq, wq)                                                \
> > -     list_for_each_entry_rcu((pwq), &(wq)->pwqs, pwqs_node)          \
> > -             if (({ assert_rcu_or_wq_mutex(wq); false; })) { }       \
> > -             else
> > +     list_for_each_entry_rcu((pwq), &(wq)->pwqs, pwqs_node,          \
> > +                              lock_is_held(&(wq->mutex).dep_map))
> >
>
> I think the definition of assert_rcu_or_wq_mutex can also be deleted.

Sure, will do. Thank you.