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.

Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
Signed-off-by: Dirk Brandewie <dirk.brandewie@gmail.com>
Link: http://lkml.kernel.org/n/tip-kzvj4xp9tmicuoqoh2w05iay@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 2 insertions, 2 deletions

diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index fb072754bc1d..9e753663f0d1 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -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;