x86/ioapic: Use legacy_pic to set correct gsi-irq mapping

Commit-ID:  b3eea29c189a0e3e2ac921e85fabfa4989ee58d7
Gitweb:     http://git.kernel.org/tip/b3eea29c189a0e3e2ac921e85fabfa4989ee58d7
Author:     Jacob Pan <[email protected]>
AuthorDate: Thu, 26 Jan 2012 17:32:04 +0000
Committer:  Ingo Molnar <[email protected]>
CommitDate: Thu, 26 Jan 2012 21:23:50 +0100

x86/ioapic: Use legacy_pic to set correct gsi-irq mapping

Using compile time NR_LEGACY_IRQS causes the wrong gsi-irq mapping on non-PC platforms, such as Moorestown. This patch uses legacy_pic abstraction to set the correct number of legacy interrupts at runtime. For Moorestown, nr_legacy_irqs = 0. We have 1:1 mapping for gsi-irq even within the legacy irq range.

---
 arch/x86/kernel/apic/io_apic.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

index fb07275..9e75366 100644
@@ -1010,7 +1010,7 @@ static int pin_2_irq(int idx, int apic, int pin)
 	} else {
 		u32 gsi = gsi_cfg->gsi_base + pin;
 
-		if (gsi >= NR_IRQS_LEGACY)
+		if (gsi >= legacy_pic->nr_legacy_irqs)
 			irq = gsi;
 		else
 			irq = gsi_top + gsi;

@@ -3610,7 +3610,7 @@ static void __init probe_nr_irqs_gsi(void)
 {
 	int nr;
 
-	nr = gsi_top + NR_IRQS_LEGACY;
+	nr = gsi_top + legacy_pic->nr_legacy_irqs;
 	if (nr > nr_irqs_gsi)
 		nr_irqs_gsi = nr;