linux-kernel - Re: [PATCH trivial] KVM: PPC: Remove superfluous check for non-zero return value

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Message-ID: <20190918225459.0f1091ad@bahia.lan>
Date:   Wed, 18 Sep 2019 22:54:59 +0200
From:   Greg Kurz <groug@...d.org>
To:     Thomas Huth <thuth@...hat.com>
Cc:     Paul Mackerras <paulus@...abs.org>, kvm-ppc@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        Jiri Kosina <trivial@...nel.org>
Subject: Re: [PATCH trivial] KVM: PPC: Remove superfluous check for non-zero
 return value

On Wed, 18 Sep 2019 18:44:36 +0200
Greg Kurz <groug@...d.org> wrote:

> On Wed, 11 Sep 2019 21:52:35 +0200
> Thomas Huth <thuth@...hat.com> wrote:
> 
> > After the kfree()s haven been removed in the previous
> > commit 9798f4ea71ea ("fix rollback when kvmppc_xive_create fails"),
> > the code can be simplified even more to simply always "return ret"
> > now.
> > 
> > Signed-off-by: Thomas Huth <thuth@...hat.com>
> > ---
> 
> This looks like a good candidate for trivial, hence Cc'ing Jiri
> and adding trivial keyword in subject.
> 
> Reviewed-by: Greg Kurz <groug@...d.org>
> 

Oops, the patch is correct but there are some fixes that require
the return 0 to stay around...

https://patchwork.ozlabs.org/project/kvm-ppc/list/?series=129957

> >  arch/powerpc/kvm/book3s_xive.c        | 5 +----
> >  arch/powerpc/kvm/book3s_xive_native.c | 5 +----
> >  2 files changed, 2 insertions(+), 8 deletions(-)
> > 
> > diff --git a/arch/powerpc/kvm/book3s_xive.c b/arch/powerpc/kvm/book3s_xive.c
> > index e3ba67095895..2f6f463fcdfb 100644
> > --- a/arch/powerpc/kvm/book3s_xive.c
> > +++ b/arch/powerpc/kvm/book3s_xive.c
> > @@ -1986,10 +1986,7 @@ static int kvmppc_xive_create(struct kvm_device *dev, u32 type)
> >  
> >  	xive->single_escalation = xive_native_has_single_escalation();
> >  
> > -	if (ret)
> > -		return ret;
> > -
> > -	return 0;
> > +	return ret;
> >  }
> >  
> >  int kvmppc_xive_debug_show_queues(struct seq_file *m, struct kvm_vcpu *vcpu)
> > diff --git a/arch/powerpc/kvm/book3s_xive_native.c b/arch/powerpc/kvm/book3s_xive_native.c
> > index a998823f68a3..7a50772f26fe 100644
> > --- a/arch/powerpc/kvm/book3s_xive_native.c
> > +++ b/arch/powerpc/kvm/book3s_xive_native.c
> > @@ -1089,10 +1089,7 @@ static int kvmppc_xive_native_create(struct kvm_device *dev, u32 type)
> >  	xive->single_escalation = xive_native_has_single_escalation();
> >  	xive->ops = &kvmppc_xive_native_ops;
> >  
> > -	if (ret)
> > -		return ret;
> > -
> > -	return 0;
> > +	return ret;
> >  }
> >  
> >  /*
>