[ACPI] acpi_register_gsi() fix needed for ACPICA 20051021

Use the #define for ACPI_LEVEL_SENSITIVE instead of assuming
non-zero, because ACPICA 20051021 changes its value to zero.

Also, use uniform variable names:
edge_level -> triggering
active_high_low -> polarity

Signed-off-by: Len Brown <len.brown@intel.com>
diff --git a/arch/ia64/kernel/acpi.c b/arch/ia64/kernel/acpi.c
index 9ad94dd..d2702c4 100644
--- a/arch/ia64/kernel/acpi.c
+++ b/arch/ia64/kernel/acpi.c
@@ -567,16 +567,16 @@
  * success: return IRQ number (>=0)
  * failure: return < 0
  */
-int acpi_register_gsi(u32 gsi, int edge_level, int active_high_low)
+int acpi_register_gsi(u32 gsi, int triggering, int polarity)
 {
 	if (has_8259 && gsi < 16)
 		return isa_irq_to_vector(gsi);
 
 	return iosapic_register_intr(gsi,
-				     (active_high_low ==
+				     (polarity ==
 				      ACPI_ACTIVE_HIGH) ? IOSAPIC_POL_HIGH :
 				     IOSAPIC_POL_LOW,
-				     (edge_level ==
+				     (triggering ==
 				      ACPI_EDGE_SENSITIVE) ? IOSAPIC_EDGE :
 				     IOSAPIC_LEVEL);
 }