linux-kernel - Re: [PATCH 1/9] powerpc,kvm: fix imbalance srcu_read

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Message-ID: <20130411215129.GU29861@linux.vnet.ibm.com>
Date:	Thu, 11 Apr 2013 14:51:29 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Paul Mackerras <paulus@...ba.org>
Cc:	Lai Jiangshan <laijs@...fujitsu.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Gleb Natapov <gleb@...hat.com>, Alexander Graf <agraf@...e.de>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	kvm@...r.kernel.org, kvm-ppc@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH 1/9] powerpc,kvm: fix imbalance srcu_read_[un]lock()

On Mon, Mar 18, 2013 at 08:26:48AM +1100, Paul Mackerras wrote:
> On Sat, Mar 16, 2013 at 12:50:49AM +0800, Lai Jiangshan wrote:
> > At the point of up_out label in kvmppc_hv_setup_htab_rma(),
> > srcu read lock is still held.
> > 
> > We have to release it before return.
> > 
> > Signed-off-by: Lai Jiangshan <laijs@...fujitsu.com>
> > Cc: Marcelo Tosatti <mtosatti@...hat.com>
> > Cc: Gleb Natapov <gleb@...hat.com>
> > Cc: Alexander Graf <agraf@...e.de>
> > Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> > Cc: Paul Mackerras <paulus@...ba.org>
> > Cc: kvm@...r.kernel.org
> > Cc: kvm-ppc@...r.kernel.org
> > ---
> >  arch/powerpc/kvm/book3s_hv.c |    2 +-
> >  1 files changed, 1 insertions(+), 1 deletions(-)
> > 
> > diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
> > index 80dcc53..c26740e 100644
> > --- a/arch/powerpc/kvm/book3s_hv.c
> > +++ b/arch/powerpc/kvm/book3s_hv.c
> > @@ -1799,7 +1799,7 @@ static int kvmppc_hv_setup_htab_rma(struct kvm_vcpu *vcpu)
> >  
> >   up_out:
> >  	up_read(&current->mm->mmap_sem);
> > -	goto out;
> > +	goto out_srcu;
> 
> Acked-by: Paul Mackerras <paulus@...ba.org>

Thank you both, queued for 3.11 (assuming no one has beat me to it).

							Thanx, Paul

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