linux-kernel - Re: [PATCH] x86, locking/spinlocks: Remove paravirt_ticketlocks

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Date:   Thu, 12 Jan 2017 15:03:39 -0500
From:   Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:     Waiman Long <longman@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        "H. Peter Anvin" <hpa@...or.com>
Cc:     linux-arch@...r.kernel.org, x86@...nel.org,
        linux-kernel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org,
        xen-devel@...ts.xenproject.org, kvm@...r.kernel.org,
        Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Jeremy Fitzhardinge <jeremy@...p.org>,
        Chris Wright <chrisw@...s-sol.org>,
        Alok Kataria <akataria@...are.com>,
        Rusty Russell <rusty@...tcorp.com.au>,
        Juergen Gross <jgross@...e.com>
Subject: Re: [PATCH] x86, locking/spinlocks: Remove
 paravirt_ticketlocks_enabled


> diff --git a/arch/x86/xen/spinlock.c b/arch/x86/xen/spinlock.c
> index e8a9ea7..a822606 100644
> --- a/arch/x86/xen/spinlock.c
> +++ b/arch/x86/xen/spinlock.c
> @@ -155,7 +155,6 @@ static __init int xen_init_spinlocks_jump(void)
>  	if (!xen_domain())
>  		return 0;
>  
> -	static_key_slow_inc(&paravirt_ticketlocks_enabled);
>  	return 0;
>  }
>  early_initcall(xen_init_spinlocks_jump);


Looks that with this change there is not much left of
xen_init_spinlocks_jump() and so it can be removed.

-boris