linux-kernel - Re: [PATCH tip/core/rcu 2/9] x86/kvm/pmu: Replace rcu_swap_protected() with rcu

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Message-ID: <dd735e5f-c326-4b53-1126-98c5e38961d3@redhat.com>
Date:   Thu, 3 Oct 2019 12:14:32 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     paulmck@...nel.org, rcu@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, mingo@...nel.org,
        jiangshanlai@...il.com, dipankar@...ibm.com,
        akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
        josh@...htriplett.org, tglx@...utronix.de, peterz@...radead.org,
        rostedt@...dmis.org, dhowells@...hat.com, edumazet@...gle.com,
        fweisbec@...il.com, oleg@...hat.com, joel@...lfernandes.org,
        Radim Krčmář <rkrcmar@...hat.com>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        kvm@...r.kernel.org
Subject: Re: [PATCH tip/core/rcu 2/9] x86/kvm/pmu: Replace
 rcu_swap_protected() with rcu_replace()

On 03/10/19 03:43, paulmck@...nel.org wrote:
> From: "Paul E. McKenney" <paulmck@...nel.org>
> 
> This commit replaces the use of rcu_swap_protected() with the more
> intuitively appealing rcu_replace() as a step towards removing
> rcu_swap_protected().
> 
> Link: https://lore.kernel.org/lkml/CAHk-=wiAsJLw1egFEE=Z7-GGtM6wcvtyytXZA1+BHqta4gg6Hw@mail.gmail.com/
> Reported-by: Linus Torvalds <torvalds@...ux-foundation.org>
> Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
> Cc: Paolo Bonzini <pbonzini@...hat.com>
> Cc: "Radim Krčmář" <rkrcmar@...hat.com>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: Borislav Petkov <bp@...en8.de>
> Cc: "H. Peter Anvin" <hpa@...or.com>
> Cc: <x86@...nel.org>
> Cc: <kvm@...r.kernel.org>
> ---
>  arch/x86/kvm/pmu.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/x86/kvm/pmu.c b/arch/x86/kvm/pmu.c
> index 46875bb..4c37266 100644
> --- a/arch/x86/kvm/pmu.c
> +++ b/arch/x86/kvm/pmu.c
> @@ -416,8 +416,8 @@ int kvm_vm_ioctl_set_pmu_event_filter(struct kvm *kvm, void __user *argp)
>  	*filter = tmp;
>  
>  	mutex_lock(&kvm->lock);
> -	rcu_swap_protected(kvm->arch.pmu_event_filter, filter,
> -			   mutex_is_locked(&kvm->lock));
> +	filter = rcu_replace(kvm->arch.pmu_event_filter, filter,
> +			     mutex_is_locked(&kvm->lock));
>  	mutex_unlock(&kvm->lock);
>  
>  	synchronize_srcu_expedited(&kvm->srcu);
> 

Should go without saying, but

Acked-by: Paolo Bonzini <pbonzini@...hat.com>

Paolo