linux-kernel - [patch 3/4] x86: vSMP: Use pvops only if platform has the capability to support it

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Date:	Thu, 20 Mar 2008 00:43:16 -0700
From:	Ravikiran G Thirumalai <kiran@...lex86.org>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>
Cc:	linux-kernel@...r.kernel.org,
	Glauber de Oliveira Costa <gcosta@...hat.com>,
	Andi Kleen <ak@...e.de>, shai@...lex86.org
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@...lex86.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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