From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from us-smtp-1.mimecast.com ([207.211.31.81]:37088 "EHLO us-smtp-delivery-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726154AbgDVQE1 (ORCPT ); Wed, 22 Apr 2020 12:04:27 -0400 Date: Wed, 22 Apr 2020 18:04:03 +0200 From: Cornelia Huck Subject: Re: [PATCH v2 1/7] KVM: s390: clean up redundant 'kvm_run' parameters Message-ID: <20200422180403.03f60b0c.cohuck@redhat.com> In-Reply-To: References: <20200422125810.34847-1-tianjia.zhang@linux.alibaba.com> <20200422125810.34847-2-tianjia.zhang@linux.alibaba.com> <20200422154543.2efba3dd.cohuck@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-s390-owner@vger.kernel.org List-ID: To: Christian Borntraeger Cc: Tianjia Zhang , pbonzini@redhat.com, tsbogend@alpha.franken.de, paulus@ozlabs.org, mpe@ellerman.id.au, benh@kernel.crashing.org, frankja@linux.ibm.com, david@redhat.com, heiko.carstens@de.ibm.com, gor@linux.ibm.com, sean.j.christopherson@intel.com, vkuznets@redhat.com, wanpengli@tencent.com, jmattson@google.com, joro@8bytes.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com, maz@kernel.org, james.morse@arm.com, julien.thierry.kdev@gmail.com, suzuki.poulose@arm.com, christoffer.dall@arm.com, peterx@redhat.com, thuth@redhat.com, kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, linux-mips@vger.kernel.org, kvm-ppc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org On Wed, 22 Apr 2020 17:58:04 +0200 Christian Borntraeger wrote: > On 22.04.20 15:45, Cornelia Huck wrote: > > On Wed, 22 Apr 2020 20:58:04 +0800 > > Tianjia Zhang wrote: > > > >> In the current kvm version, 'kvm_run' has been included in the 'kvm_vcpu' > >> structure. Earlier than historical reasons, many kvm-related function > > > > s/Earlier than/For/ ? > > > >> parameters retain the 'kvm_run' and 'kvm_vcpu' parameters at the same time. > >> This patch does a unified cleanup of these remaining redundant parameters. > >> > >> Signed-off-by: Tianjia Zhang > >> --- > >> arch/s390/kvm/kvm-s390.c | 37 ++++++++++++++++++++++--------------- > >> 1 file changed, 22 insertions(+), 15 deletions(-) > >> > >> diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c > >> index e335a7e5ead7..d7bb2e7a07ff 100644 > >> --- a/arch/s390/kvm/kvm-s390.c > >> +++ b/arch/s390/kvm/kvm-s390.c > >> @@ -4176,8 +4176,9 @@ static int __vcpu_run(struct kvm_vcpu *vcpu) > >> return rc; > >> } > >> > >> -static void sync_regs_fmt2(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) > >> +static void sync_regs_fmt2(struct kvm_vcpu *vcpu) > >> { > >> + struct kvm_run *kvm_run = vcpu->run; > >> struct runtime_instr_cb *riccb; > >> struct gs_cb *gscb; > >> > >> @@ -4235,7 +4236,7 @@ static void sync_regs_fmt2(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) > >> } > >> if (vcpu->arch.gs_enabled) { > >> current->thread.gs_cb = (struct gs_cb *) > >> - &vcpu->run->s.regs.gscb; > >> + &kvm_run->s.regs.gscb; > > > > Not sure if these changes (vcpu->run-> => kvm_run->) are really worth > > it. (It seems they amount to at least as much as the changes advertised > > in the patch description.) > > > > Other opinions? > > Agreed. It feels kind of random. Maybe just do the first line (move kvm_run from the > function parameter list into the variable declaration)? Not sure if this is better. > There's more in this patch that I cut... but I think just moving kvm_run from the parameter list would be much less disruptive.