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From: tip-bot for Ingo Molnar on 26 Feb 2010 05:30
Commit-ID: f6a929eb62ef43cae16ba6d4e2c64b4e430fe7a4
Gitweb: http://git.kernel.org/tip/f6a929eb62ef43cae16ba6d4e2c64b4e430fe7a4
Author: Ingo Molnar <mingo(a)elte.hu>
AuthorDate: Fri, 26 Feb 2010 11:17:16 +0100
Committer: Ingo Molnar <mingo(a)elte.hu>
CommitDate: Fri, 26 Feb 2010 11:17:16 +0100

x86: apic: Fix mismerge, add arch_probe_nr_irqs() again

Merge commit aef55d4922 mis-merged io_apic.c so we lost the
arch_probe_nr_irqs() method.

This caused subtle boot breakages (udev confusion likely
due to missing drivers) with certain configs.

Cc: H. Peter Anvin <hpa(a)zytor.com>
Cc: Yinghai Lu <yinghai(a)kernel.org>
LKML-Reference: <20100207210250.GB8256(a)jenkins.home.ifup.org>
Signed-off-by: Ingo Molnar <mingo(a)elte.hu>
---
arch/x86/kernel/apic/io_apic.c | 22 ++++++++++++++++++++++
1 files changed, 22 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 527390c..c13ab8f 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -3874,6 +3874,28 @@ void __init probe_nr_irqs_gsi(void)
printk(KERN_DEBUG "nr_irqs_gsi: %d\n", 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 0;
+}
+#endif
+
static int __io_apic_set_pci_routing(struct device *dev, int irq,
struct io_apic_irq_attr *irq_attr)
{
--
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