linux-kernel - Re: [PATCH v2 2/5] KVM: add KVM request variants without barrier

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Date:   Tue, 28 Feb 2017 15:34:24 +0800
From:   Peter Xu <peterx@...hat.com>
To:     Radim Krčmář <rkrcmar@...hat.com>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        Paolo Bonzini <pbonzini@...hat.com>,
        Andrew Jones <drjones@...hat.com>,
        Marc Zyngier <marc.zyngier@....com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Cornelia Huck <cornelia.huck@...ibm.com>,
        James Hogan <james.hogan@...tec.com>,
        Paul Mackerras <paulus@...abs.org>,
        Christoffer Dall <christoffer.dall@...aro.org>,
        David Hildenbrand <david@...hat.com>
Subject: Re: [PATCH v2 2/5] KVM: add KVM request variants without barrier

On Fri, Feb 24, 2017 at 08:49:59PM +0100, Radim Krčmář wrote:
> The leading underscores denote that the call is just a bitop wrapper.
> 
> Switch all users of open-coded set/check/test to kvm_request ones.
> 
> Automated by coccinelle script:
>   @@
>   expression VCPU, REQ;
>   @@
>   -set_bit(REQ, &VCPU->requests)
>   +__kvm_request_set(REQ, VCPU)
> 
>   @@
>   expression VCPU, REQ;
>   @@
>   -clear_bit(REQ, &VCPU->requests)
>   +__kvm_request_clear(REQ, VCPU)
> 
>   @@
>   expression VCPU, REQ;
>   @@
>   -test_bit(REQ, &VCPU->requests)
>   +__kvm_request_test(REQ, VCPU)
> 
> Signed-off-by: Radim Krčmář <rkrcmar@...hat.com>
> ---
>  v2: clear_bit in __kvm_request_clear [Paolo]
> ---
>  arch/mips/kvm/emulate.c           |  2 +-
>  arch/powerpc/kvm/book3s_pr.c      |  2 +-
>  arch/powerpc/kvm/book3s_pr_papr.c |  2 +-
>  arch/powerpc/kvm/booke.c          |  4 ++--
>  arch/powerpc/kvm/powerpc.c        |  2 +-
>  arch/s390/kvm/kvm-s390.c          |  2 +-
>  arch/x86/kvm/vmx.c                |  2 +-
>  arch/x86/kvm/x86.c                | 14 +++++++-------
>  include/linux/kvm_host.h          | 23 ++++++++++++++++++++---
>  9 files changed, 35 insertions(+), 18 deletions(-)
> 
> diff --git a/arch/mips/kvm/emulate.c b/arch/mips/kvm/emulate.c
> index ee4af898bcf6..552ae2b5e911 100644
> --- a/arch/mips/kvm/emulate.c
> +++ b/arch/mips/kvm/emulate.c
> @@ -865,7 +865,7 @@ enum emulation_result kvm_mips_emul_wait(struct kvm_vcpu *vcpu)
>  		 * check if any I/O interrupts are pending.
>  		 */
>  		if (kvm_request_test_and_clear(KVM_REQ_UNHALT, vcpu)) {
> -			clear_bit(KVM_REQ_UNHALT, &vcpu->requests);
> +			__kvm_request_clear(KVM_REQ_UNHALT, vcpu);

Shall we just remove above line since we cleared it already?

-- peterx