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

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Message-ID: <20230109192228.GV4028633@paulmck-ThinkPad-P17-Gen-1>
Date:   Mon, 9 Jan 2023 11:22:28 -0800
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     Sean Christopherson <seanjc@...gle.com>
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 Mon, Jan 09, 2023 at 05:43:23PM +0000, Sean Christopherson wrote:
> 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.

No problem, and will do on my next rebase.  I might end up with a long
list of Cc's, but so it goes.  I will of course send the result as a
reply to this message.

							Thanx, Paul

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