x86, ioapic: Simplify probe_nr_irqs_gsi.

Use the global gsi_end value now that all ioapics have
valid gsi numbers instead of a combination of acpi_probe_gsi
and walking all of the ioapics and couting their number of
entries by hand if acpi_probe_gsi gave us an answer we did
not like.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
LKML-Reference: <1269936436-7039-13-git-send-email-ebiederm@xmission.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>

1 files changed, 3 insertions, 14 deletions

diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 0d35f46929d1..9f3f6ca86dac 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -3850,22 +3850,11 @@ int __init io_apic_get_redir_entries (int ioapic)
 
 void __init probe_nr_irqs_gsi(void)
 {
-        int nr = 0;
+        int nr;
 
-        nr = acpi_probe_gsi();
-        if (nr > nr_irqs_gsi) {
+        nr = gsi_end + 1;
+        if (nr > nr_irqs_gsi)
                 nr_irqs_gsi = nr;
-        } else {
-                /* for acpi=off or acpi is not compiled in */
-                int idx;
-
-                nr = 0;
-                for (idx = 0; idx < nr_ioapics; idx++)
-                        nr += io_apic_get_redir_entries(idx);
-
-                if (nr > nr_irqs_gsi)
-                        nr_irqs_gsi = nr;
-        }
 
         printk(KERN_DEBUG "nr_irqs_gsi: %d\n", nr_irqs_gsi);
 }