linux-kernel - [PATCH 5/5] x86: update nr

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Message-id: <1262951595-1729-5-git-send-email-yinghai@kernel.org>
Date:	Fri, 08 Jan 2010 03:53:15 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Jesse Brandeburg <jesse.brandeburg@...el.com>
Cc:	linux-kernel@...r.kernel.org, Yinghai Lu <yinghai@...nel.org>
Subject: [PATCH 5/5] x86: update nr_irqs according cpu num

that is max number on run time.

Signed-off-by: Yinghai Lu <yinghai@...nel.org>

---
 arch/x86/kernel/apic/io_apic.c |   16 +++++++---------
 1 file changed, 7 insertions(+), 9 deletions(-)

Index: linux-2.6/arch/x86/kernel/apic/io_apic.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/apic/io_apic.c
+++ linux-2.6/arch/x86/kernel/apic/io_apic.c
@@ -3840,16 +3840,14 @@ int __init arch_probe_nr_irqs(void)
 {
 	int nr;
 
-	if (nr_irqs > (NR_VECTORS * nr_cpu_ids))
-		nr_irqs = NR_VECTORS * nr_cpu_ids;
-
-	nr = nr_irqs_gsi + 8 * nr_cpu_ids;
-#if defined(CONFIG_PCI_MSI) || defined(CONFIG_HT_IRQ)
-	/*
-	 * for MSI and HT dyn irq
-	 */
-	nr += nr_irqs_gsi * 64;
+	nr = NR_VECTORS - FIRST_DEVICE_VECTOR;
+#ifdef CONFIG_SMP
+	/* system vectors */
+	nr -= 0x10;
 #endif
+	nr *= nr_cpu_ids;
+	nr += FIRST_DEVICE_VECTOR - IRQ0_VECTOR;
+
 	if (nr < nr_irqs)
 		nr_irqs = nr;
 
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