linux-kernel - Re: [PATCH rcu 01/27] arch/x86: Remove "select SRCU"

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Date:   Mon, 9 Jan 2023 17:43:23 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     "Paul E. McKenney" <paulmck@...nel.org>
Cc:     rcu@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-team@...a.com, rostedt@...dmis.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Paolo Bonzini <pbonzini@...hat.com>, x86@...nel.org,
        kvm@...r.kernel.org
Subject: Re: [PATCH rcu 01/27] arch/x86: Remove "select SRCU"

On Wed, Jan 04, 2023, Paul E. McKenney wrote:
> Now that the SRCU Kconfig option is unconditionally selected, there is
> no longer any point in selecting it.  Therefore, remove the "select SRCU"
> Kconfig statements.
> 
> Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: Borislav Petkov <bp@...en8.de>
> Cc: Dave Hansen <dave.hansen@...ux.intel.com>
> Cc: "H. Peter Anvin" <hpa@...or.com>
> Cc: Sean Christopherson <seanjc@...gle.com>
> Cc: Paolo Bonzini <pbonzini@...hat.com>
> Cc: <x86@...nel.org>
> Cc: <kvm@...r.kernel.org>
> ---

...

> diff --git a/arch/x86/kvm/Kconfig b/arch/x86/kvm/Kconfig
> index fbeaa9ddef598..9306d99585188 100644
> --- a/arch/x86/kvm/Kconfig
> +++ b/arch/x86/kvm/Kconfig
> @@ -46,7 +46,6 @@ config KVM
>  	select KVM_XFER_TO_GUEST_WORK
>  	select KVM_GENERIC_DIRTYLOG_READ_PROTECT
>  	select KVM_VFIO
> -	select SRCU

Would it be too much trouble to bundle all of the KVM changes into a single patch?
The SRCU requirement is a generic KVM requirement that's handled in the arch Kconfigs
purely because of KVM's somewhat roundabout Kconfig setup.

>  	select INTERVAL_TREE
>  	select HAVE_KVM_PM_NOTIFIER if PM
>  	help
> -- 
> 2.31.1.189.g2e36527f23
>