linux-kernel - [PATCH] x86: set nr_irqs_gsi only in probe_nr_irqs

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Message-ID: <4B84E09D.4090600@kernel.org>
Date:	Wed, 24 Feb 2010 00:17:33 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>
CC:	"Pan, Jacob jun" <jacob.jun.pan@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH] x86: set nr_irqs_gsi only in probe_nr_irqs_gsi


don't clear that in arch_early_irq_init

probe_nr_irqs_gsi is always called when ioapic is selected in config.

so even for mrst, print out from probe_nr_irqs_gsi report correct
nr_irqs_gsi

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

---
 arch/x86/kernel/apic/io_apic.c |   10 +++++++---
 1 file changed, 7 insertions(+), 3 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
@@ -151,10 +151,12 @@ int __init arch_early_irq_init(void)
 	int node;
 	int i;
 
-	if (!legacy_pic->nr_legacy_irqs) {
-		nr_irqs_gsi = 0;
+	/*
+	 * in case, io apic is not detected
+	 * then setup_IO_APIC() is not called
+	 */
+	if (!legacy_pic->nr_legacy_irqs)
 		io_apic_irqs = ~0UL;
-	}
 
 	cfg = irq_cfgx;
 	count = ARRAY_SIZE(irq_cfgx);
@@ -3857,6 +3859,8 @@ void __init probe_nr_irqs_gsi(void)
 {
 	int nr = 0;
 
+	nr_irqs_gsi = legacy_pic->nr_legacy_irqs;
+
 	nr = acpi_probe_gsi();
 	if (nr > nr_irqs_gsi) {
 		nr_irqs_gsi = nr;
--
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