Commit-ID: b8fa70b51aa76737bdb6b493901ef7376977489c Gitweb: http://git.kernel.org/tip/b8fa70b51aa76737bdb6b493901ef7376977489c Author: Jeremy Fitzhardinge <jer...@goop.org> AuthorDate: Fri, 9 Aug 2013 19:51:54 +0530 Committer: H. Peter Anvin <h...@linux.intel.com> CommitDate: Fri, 9 Aug 2013 07:53:37 -0700
xen, pvticketlocks: Add xen_nopvspin parameter to disable xen pv ticketlocks Signed-off-by: Jeremy Fitzhardinge <jer...@goop.org> Link: http://lkml.kernel.org/r/1376058122-8248-7-git-send-email-raghavendra...@linux.vnet.ibm.com Reviewed-by: Konrad Rzeszutek Wilk <konrad.w...@oracle.com> Signed-off-by: Raghavendra K T <raghavendra...@linux.vnet.ibm.com> Acked-by: Ingo Molnar <mi...@kernel.org> Signed-off-by: H. Peter Anvin <h...@linux.intel.com> --- arch/x86/xen/spinlock.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/arch/x86/xen/spinlock.c b/arch/x86/xen/spinlock.c index a458729..669a971 100644 --- a/arch/x86/xen/spinlock.c +++ b/arch/x86/xen/spinlock.c @@ -244,6 +244,8 @@ void xen_uninit_lock_cpu(int cpu) per_cpu(irq_name, cpu) = NULL; } +static bool xen_pvspin __initdata = true; + void __init xen_init_spinlocks(void) { /* @@ -253,10 +255,22 @@ void __init xen_init_spinlocks(void) if (xen_hvm_domain()) return; + 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; -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
