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authorThomas Gleixner <tglx@linutronix.de>2009-08-29 20:09:57 +0400
committerThomas Gleixner <tglx@linutronix.de>2009-08-31 21:23:09 +0400
commitbc07844a33734c4b2f32ef26d942d2f3ef9302ea (patch)
treeae8cbb6dc9a17baca82a829e77c5b7fc5781b2a5 /arch/x86/include/asm/io_apic.h
parent3f4110a48a749a1aa1c54fb807afb3f32f49711c (diff)
downloadlinux-bc07844a33734c4b2f32ef26d942d2f3ef9302ea.tar.xz
x86: Distangle ioapic and i8259
The proposed Moorestown support patches use an extra feature flag mechanism to make the ioapic work w/o an i8259. There is a much simpler solution. Most i8259 specific functions are already called dependend on the irq number less than NR_IRQS_LEGACY. Replacing that constant by a read_mostly variable which can be set to 0 by the platform setup code allows us to achieve the same without any special feature flags. That trivial change allows us to proceed with MRST w/o doing a full blown overhaul of the ioapic code which would delay MRST unduly. Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/x86/include/asm/io_apic.h')
-rw-r--r--arch/x86/include/asm/io_apic.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/include/asm/io_apic.h b/arch/x86/include/asm/io_apic.h
index 2b8aeb89933a..e1f89a1a07ef 100644
--- a/arch/x86/include/asm/io_apic.h
+++ b/arch/x86/include/asm/io_apic.h
@@ -143,6 +143,8 @@ extern int noioapicreroute;
/* 1 if the timer IRQ uses the '8259A Virtual Wire' mode */
extern int timer_through_8259;
+extern void io_apic_disable_legacy(void);
+
/*
* If we use the IO-APIC for IRQ routing, disable automatic
* assignment of PCI IRQ's.