linux-kernel - Re: [PATCH v2] x86, locking/spinlocks: Remove paravirt_ticketlocks

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Message-ID: <76a962e4-14a9-74ab-6e6c-89fe3b8c1a1d@oracle.com>
Date:   Thu, 12 Jan 2017 16:39:36 -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 v2] x86, locking/spinlocks: Remove
 paravirt_ticketlocks_enabled


> diff --git a/arch/x86/xen/spinlock.c b/arch/x86/xen/spinlock.c
> index e8a9ea7..25a7c43 100644
> --- a/arch/x86/xen/spinlock.c
> +++ b/arch/x86/xen/spinlock.c
> @@ -141,25 +141,6 @@ void __init xen_init_spinlocks(void)
>  	pv_lock_ops.vcpu_is_preempted = PV_CALLEE_SAVE(xen_vcpu_stolen);
>  }
>  
> -/*
> - * While the jump_label init code needs to happend _after_ the jump labels are
> - * enabled and before SMP is started. Hence we use pre-SMP initcall level
> - * init. We cannot do it in xen_init_spinlocks as that is done before
> - * jump labels are activated.
> - */
> -static __init int xen_init_spinlocks_jump(void)
> -{
> -	if (!xen_pvspin)
> -		return 0;
> -
> -	if (!xen_domain())
> -		return 0;
> -
> -	static_key_slow_inc(&paravirt_ticketlocks_enabled);
> -	return 0;
> -}
> -early_initcall(xen_init_spinlocks_jump);
> -
>  static __init int xen_parse_nopvspin(char *arg)
>  {
>  	xen_pvspin = false;


Xen bits:

Reviewed-by: Boris Ostrovsky <boris.ostrovsky@...cle.com>