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    Subject[PATCH RFC V7 6/12] xen/pvticketlocks: add xen_nopvspin parameter to disable xen pv ticketlocks
    From: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>

    Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
    Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
    Signed-off-by: Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com>
    ---
    arch/x86/xen/spinlock.c | 14 ++++++++++++++
    1 files changed, 14 insertions(+), 0 deletions(-)
    diff --git a/arch/x86/xen/spinlock.c b/arch/x86/xen/spinlock.c
    index 982e64b..c9bf890 100644
    --- a/arch/x86/xen/spinlock.c
    +++ b/arch/x86/xen/spinlock.c
    @@ -223,12 +223,26 @@ void xen_uninit_lock_cpu(int cpu)
    unbind_from_irqhandler(per_cpu(lock_kicker_irq, cpu), NULL);
    }

    +static bool xen_pvspin __initdata = true;
    +
    void __init xen_init_spinlocks(void)
    {
    + if (!xen_pvspin) {
    + printk(KERN_DEBUG "xen: PV spinlocks disabled\n");
    + return;
    + }
    +
    pv_lock_ops.lock_spinning = xen_lock_spinning;
    pv_lock_ops.unlock_kick = xen_unlock_kick;
    }

    +static __init int xen_parse_nopvspin(char *arg)
    +{
    + xen_pvspin = false;
    + return 0;
    +}
    +early_param("xen_nopvspin", xen_parse_nopvspin);
    +
    #ifdef CONFIG_XEN_DEBUG_FS

    static struct dentry *d_spin_debug;


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