From: Dexuan-Linux Cui <dexuan.linux@gmail.com>
To: Naresh Kamboju <naresh.kamboju@linaro.org>
Cc: madhuparnabhowmik10@gmail.com,
"Paul E. McKenney" <paulmck@kernel.org>,
Josh Triplett <josh@joshtriplett.org>,
Joel Fernandes <joel@joelfernandes.org>,
Paolo Bonzini <pbonzini@redhat.com>,
rcu@vger.kernel.org, open list <linux-kernel@vger.kernel.org>,
X86 ML <x86@kernel.org>, kvm list <kvm@vger.kernel.org>,
frextrite@gmail.com, lkft-triage@lists.linaro.org,
Dexuan Cui <decui@microsoft.com>,
juhlee@microsoft.com
Subject: Re: [PATCH 2/2] kvm: mmu: page_track: Fix RCU list API usage
Date: Thu, 16 Jul 2020 17:19:52 -0700 [thread overview]
Message-ID: <CAA42JLY2L6xFju_qZsVguGtXvDMqfCKbO_h1K9NJPjmqJEav=Q@mail.gmail.com> (raw)
In-Reply-To: <CA+G9fYuVmTcttBpVtegwPbKxufupPOtk_WqEtOdS+HDQi7WS9Q@mail.gmail.com>
On Thu, Jul 16, 2020 at 7:47 AM Naresh Kamboju
<naresh.kamboju@linaro.org> wrote:
>
> On Sun, 12 Jul 2020 at 21:39, Paul E. McKenney <paulmck@kernel.org> wrote:
> >
> > On Sun, Jul 12, 2020 at 06:40:03PM +0530, madhuparnabhowmik10@gmail.com wrote:
> > > From: Madhuparna Bhowmik <madhuparnabhowmik10@gmail.com>
> > >
> > > Use hlist_for_each_entry_srcu() instead of hlist_for_each_entry_rcu()
> > > as it also checkes if the right lock is held.
> > > Using hlist_for_each_entry_rcu() with a condition argument will not
> > > report the cases where a SRCU protected list is traversed using
> > > rcu_read_lock(). Hence, use hlist_for_each_entry_srcu().
> > >
> > > Signed-off-by: Madhuparna Bhowmik <madhuparnabhowmik10@gmail.com>
> >
> > I queued both for testing and review, thank you!
> >
> > In particular, this one needs an ack by the maintainer.
> >
> > Thanx, Paul
> >
> > > arch/x86/kvm/mmu/page_track.c | 6 ++++--
> > > 1 file changed, 4 insertions(+), 2 deletions(-)
> > >
> > > diff --git a/arch/x86/kvm/mmu/page_track.c b/arch/x86/kvm/mmu/page_track.c
> > > index a7bcde34d1f2..a9cd17625950 100644
> > > --- a/arch/x86/kvm/mmu/page_track.c
> > > +++ b/arch/x86/kvm/mmu/page_track.c
> > > @@ -229,7 +229,8 @@ void kvm_page_track_write(struct kvm_vcpu *vcpu, gpa_t gpa, const u8 *new,
> > > return;
> > >
> > > idx = srcu_read_lock(&head->track_srcu);
> > > - hlist_for_each_entry_rcu(n, &head->track_notifier_list, node)
> > > + hlist_for_each_entry_srcu(n, &head->track_notifier_list, node,
> > > + srcu_read_lock_held(&head->track_srcu))
>
> x86 build failed on linux -next 20200716.
>
> arch/x86/kvm/mmu/page_track.c: In function 'kvm_page_track_write':
> include/linux/rculist.h:727:30: error: left-hand operand of comma
> expression has no effect [-Werror=unused-value]
> for (__list_check_srcu(cond), \
> ^
> arch/x86/kvm/mmu/page_track.c:232:2: note: in expansion of macro
> 'hlist_for_each_entry_srcu'
> hlist_for_each_entry_srcu(n, &head->track_notifier_list, node,
> ^~~~~~~~~~~~~~~~~~~~~~~~~
> arch/x86/kvm/mmu/page_track.c: In function 'kvm_page_track_flush_slot':
> include/linux/rculist.h:727:30: error: left-hand operand of comma
> expression has no effect [-Werror=unused-value]
> for (__list_check_srcu(cond), \
> ^
> arch/x86/kvm/mmu/page_track.c:258:2: note: in expansion of macro
> 'hlist_for_each_entry_srcu'
> hlist_for_each_entry_srcu(n, &head->track_notifier_list, node,
> ^~~~~~~~~~~~~~~~~~~~~~~~~
> cc1: all warnings being treated as errors
> make[3]: *** [arch/x86/kvm/mmu/page_track.o] Error 1
>
> build link,
> https://ci.linaro.org/view/lkft/job/openembedded-lkft-linux-next/DISTRO=lkft,MACHINE=intel-corei7-64,label=docker-lkft/815/consoleText
>
> --
> Linaro LKFT
> https://lkft.linaro.org
Hi, we're seeing the same building failure with the latest linux-next tree.
Thanks,
Dexuan
next prev parent reply other threads:[~2020-07-17 0:20 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-12 13:10 [PATCH 1/2] rculist : Introduce list/hlist_for_each_entry_srcu() macros madhuparnabhowmik10
2020-07-12 13:10 ` [PATCH 2/2] kvm: mmu: page_track: Fix RCU list API usage madhuparnabhowmik10
2020-07-12 16:08 ` Paul E. McKenney
2020-07-16 14:44 ` Naresh Kamboju
2020-07-17 0:19 ` Dexuan-Linux Cui [this message]
2020-07-17 17:07 ` Paul E. McKenney
2020-07-17 18:03 ` Daniel Díaz
2020-07-17 18:25 ` Daniel Díaz
2020-07-17 19:05 ` Naresh Kamboju
2020-07-18 0:12 ` Paul E. McKenney
2020-07-19 12:22 ` Naresh Kamboju
2020-07-19 16:08 ` Paul E. McKenney
2020-07-20 14:13 ` Naresh Kamboju
2020-07-20 23:31 ` Paul E. McKenney
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