linux-kernel - [PATCH] x86, sparseirq: let nr_irqs equal to NR

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Date:	Mon, 27 Dec 2010 16:54:11 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH] x86, sparseirq: let nr_irqs equal to NR_IRQS



For x86_64 system:
when we have 128 cpus with 5 ioapics, will have nr_irqs = 3064
	120 + 8 * 128 + 120 * 16
systems could take 20 pcie,  when intel 10g are used with
sriov and ixgbevf, every vf will need 3 irqs, and one device
have 64 vf. so will need 20 * 3 * 64 = 3840.
some 6 ports Intel 10gb may need more.

Just remove that function for x86, and let nr_irqs to NR_IRQS
because We already have radix-tree and bit_map for searching desc for irq.

Notes: long before same vresion cause one of Ingo's setup udev hang...

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

---
 arch/x86/kernel/apic/io_apic.c |   22 ----------------------
 1 file changed, 22 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
@@ -3637,28 +3637,6 @@ int get_nr_irqs_gsi(void)
 	return nr_irqs_gsi;
 }
 
-#ifdef CONFIG_SPARSE_IRQ
-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 * 16;
-#endif
-	if (nr < nr_irqs)
-		nr_irqs = nr;
-
-	return NR_IRQS_LEGACY;
-}
-#endif
-
 static int __io_apic_set_pci_routing(struct device *dev, int irq,
 				struct io_apic_irq_attr *irq_attr)
 {
--
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