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-rw-r--r--arch/x86/kernel/acpi/boot.c23
-rw-r--r--arch/x86/kernel/io_apic.c20
2 files changed, 38 insertions, 5 deletions
diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
index d37593c2f438..7678f10c4568 100644
--- a/arch/x86/kernel/acpi/boot.c
+++ b/arch/x86/kernel/acpi/boot.c
@@ -973,6 +973,29 @@ void __init mp_register_ioapic(int id, u32 address, u32 gsi_base)
nr_ioapics++;
}
+int __init acpi_probe_gsi(void)
+{
+ int idx;
+ int gsi;
+ int max_gsi = 0;
+
+ if (acpi_disabled)
+ return 0;
+
+ if (!acpi_ioapic)
+ return 0;
+
+ max_gsi = 0;
+ for (idx = 0; idx < nr_ioapics; idx++) {
+ gsi = mp_ioapic_routing[idx].gsi_end;
+
+ if (gsi > max_gsi)
+ max_gsi = gsi;
+ }
+
+ return max_gsi + 1;
+}
+
static void assign_to_mp_irq(struct mp_config_intsrc *m,
struct mp_config_intsrc *mp_irq)
{
diff --git a/arch/x86/kernel/io_apic.c b/arch/x86/kernel/io_apic.c
index 9b0c480c383b..bc7ac4da90d7 100644
--- a/arch/x86/kernel/io_apic.c
+++ b/arch/x86/kernel/io_apic.c
@@ -3841,14 +3841,24 @@ int __init io_apic_get_redir_entries (int ioapic)
void __init probe_nr_irqs_gsi(void)
{
- int idx;
int nr = 0;
- for (idx = 0; idx < nr_ioapics; idx++)
- nr += io_apic_get_redir_entries(idx) + 1;
-
- if (nr > nr_irqs_gsi)
+ nr = acpi_probe_gsi();
+ 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) + 1;
+
+ if (nr > nr_irqs_gsi)
+ nr_irqs_gsi = nr;
+ }
+
+ printk(KERN_DEBUG "nr_irqs_gsi: %d\n", nr_irqs_gsi);
}
/* --------------------------------------------------------------------------