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Subject[patch 3/4] x86: vSMP: Use pvops only if platform has the capability to support it
Re-arrange set_vsmp_pv_ops so that pv_ops are set only if
the platform has capability to support paravirtualized irq ops

Signed-off-by: Ravikiran Thirumalai <kiran@scalex86.org>

Index: linux.git.trees/arch/x86/kernel/vsmp_64.c
===================================================================
--- linux.git.trees.orig/arch/x86/kernel/vsmp_64.c 2008-03-19 20:53:34.267707163 -0700
+++ linux.git.trees/arch/x86/kernel/vsmp_64.c 2008-03-19 21:21:47.853254516 -0700
@@ -78,12 +78,6 @@ static void __init set_vsmp_pv_ops(void)
void *address;
unsigned int cap, ctl, cfg;

- pv_irq_ops.irq_disable = vsmp_irq_disable;
- pv_irq_ops.irq_enable = vsmp_irq_enable;
- pv_irq_ops.save_fl = vsmp_save_fl;
- pv_irq_ops.restore_fl = vsmp_restore_fl;
- pv_init_ops.patch = vsmp_patch;
-
/* set vSMP magic bits to indicate vSMP capable kernel */
cfg = read_pci_config(0, 0x1f, 0, PCI_BASE_ADDRESS_0);
address = early_ioremap(cfg, 8);
@@ -92,7 +86,13 @@ static void __init set_vsmp_pv_ops(void)
printk(KERN_INFO "vSMP CTL: capabilities:0x%08x control:0x%08x\n",
cap, ctl);
if (cap & ctl & (1 << 4)) {
- /* Turn on vSMP IRQ fastpath handling (see system.h) */
+ /* Setup irq ops and turn on vSMP IRQ fastpath handling */
+ pv_irq_ops.irq_disable = vsmp_irq_disable;
+ pv_irq_ops.irq_enable = vsmp_irq_enable;
+ pv_irq_ops.save_fl = vsmp_save_fl;
+ pv_irq_ops.restore_fl = vsmp_restore_fl;
+ pv_init_ops.patch = vsmp_patch;
+
ctl &= ~(1 << 4);
writel(ctl, address + 4);
ctl = readl(address + 4);

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