[Xen-devel] [PATCH] xen: disable interrupts early, as start_kern

To:	Ingo Molnar <mingo@xxxxxxx>
Subject:	[Xen-devel] [PATCH] xen: disable interrupts early, as start_kernel expects
From:	Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Date:	Wed, 25 Feb 2009 09:42:25 -0800
Cc:	Mark McLoughlin <markmc@xxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, Stable Kernel <stable@xxxxxxxxxx>
Delivery-date:	Wed, 25 Feb 2009 09:42:51 -0800
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This avoids a lockdep warning from:
        if (DEBUG_LOCKS_WARN_ON(unlikely(!early_boot_irqs_enabled)))
                return;
in trace_hardirqs_on_caller();

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>

diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index 95ff6a0..905cc1c 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -939,6 +939,9 @@ asmlinkage void __init xen_start_kernel(void)
           possible map and a non-dummy shared_info. */
        per_cpu(xen_vcpu, 0) = &HYPERVISOR_shared_info->vcpu_info[0];

+       local_irq_disable();
+       early_boot_irqs_off();
+
        xen_raw_console_write("mapping kernel into physical memory\n");
        pgd = xen_setup_kernel_pagetable(pgd, xen_start_info->nr_pages);




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[Xen-devel] [PATCH] xen: disable interrupts early, as start_kernel expec