ACPICA: Debugger: refactor to fix unused variable warning

When building ACPICA in the Linux kernel with Clang with ACPI_DISASSEMBLER
not defined, we get a the following warning on variable display_op:

warning: variable 'display_op' set but not used [-Wunused-but-set-variable]

Fix this by refactoring display_op and parent_op code in a separate function.

Suggested-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Erik Schmauss <erik.schmauss@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/acpi/acpica/dbxface.c b/drivers/acpi/acpica/dbxface.c
index f252672..3eb45ea 100644 (file)
--- a/drivers/acpi/acpica/dbxface.c
+++ b/drivers/acpi/acpica/dbxface.c
@@ -24,6 +24,13 @@ acpi_db_start_command(struct acpi_walk_state *walk_state,
 void acpi_db_method_end(struct acpi_walk_state *walk_state);
 #endif
 
+#ifdef ACPI_DISASSEMBLER
+static union acpi_parse_object *acpi_db_get_display_op(struct acpi_walk_state
+                                                      *walk_state,
+                                                      union acpi_parse_object
+                                                      *op);
+#endif
+
 /*******************************************************************************
  *
  * FUNCTION:    acpi_db_start_command
@@ -113,6 +120,70 @@ void acpi_db_signal_break_point(struct acpi_walk_state *walk_state)
        acpi_os_printf("**break** Executed AML BreakPoint opcode\n");
 }
 
+#ifdef ACPI_DISASSEMBLER
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_db_get_display_op
+ *
+ * PARAMETERS:  walk_state      - Current walk
+ *              op              - Current executing op (from aml interpreter)
+ *
+ * RETURN:      Opcode to display
+ *
+ * DESCRIPTION: Find the opcode to display during single stepping
+ *
+ ******************************************************************************/
+
+static union acpi_parse_object *acpi_db_get_display_op(struct acpi_walk_state
+                                                      *walk_state,
+                                                      union acpi_parse_object
+                                                      *op)
+{
+       union acpi_parse_object *display_op;
+       union acpi_parse_object *parent_op;
+
+       display_op = op;
+       parent_op = op->common.parent;
+       if (parent_op) {
+               if ((walk_state->control_state) &&
+                   (walk_state->control_state->common.state ==
+                    ACPI_CONTROL_PREDICATE_EXECUTING)) {
+                       /*
+                        * We are executing the predicate of an IF or WHILE statement
+                        * Search upwards for the containing IF or WHILE so that the
+                        * entire predicate can be displayed.
+                        */
+                       while (parent_op) {
+                               if ((parent_op->common.aml_opcode == AML_IF_OP)
+                                   || (parent_op->common.aml_opcode ==
+                                       AML_WHILE_OP)) {
+                                       display_op = parent_op;
+                                       break;
+                               }
+                               parent_op = parent_op->common.parent;
+                       }
+               } else {
+                       while (parent_op) {
+                               if ((parent_op->common.aml_opcode == AML_IF_OP)
+                                   || (parent_op->common.aml_opcode ==
+                                       AML_ELSE_OP)
+                                   || (parent_op->common.aml_opcode ==
+                                       AML_SCOPE_OP)
+                                   || (parent_op->common.aml_opcode ==
+                                       AML_METHOD_OP)
+                                   || (parent_op->common.aml_opcode ==
+                                       AML_WHILE_OP)) {
+                                       break;
+                               }
+                               display_op = parent_op;
+                               parent_op = parent_op->common.parent;
+                       }
+               }
+       }
+       return display_op;
+}
+#endif
+
 /*******************************************************************************
  *
  * FUNCTION:    acpi_db_single_step
@@ -134,8 +205,6 @@ acpi_db_single_step(struct acpi_walk_state *walk_state,
        union acpi_parse_object *next;
        acpi_status status = AE_OK;
        u32 original_debug_level;
-       union acpi_parse_object *display_op;
-       union acpi_parse_object *parent_op;
        u32 aml_offset;
 
        ACPI_FUNCTION_ENTRY();
@@ -222,51 +291,12 @@ acpi_db_single_step(struct acpi_walk_state *walk_state,
                next = op->common.next;
                op->common.next = NULL;
 
-               display_op = op;
-               parent_op = op->common.parent;
-               if (parent_op) {
-                       if ((walk_state->control_state) &&
-                           (walk_state->control_state->common.state ==
-                            ACPI_CONTROL_PREDICATE_EXECUTING)) {
-                               /*
-                                * We are executing the predicate of an IF or WHILE statement
-                                * Search upwards for the containing IF or WHILE so that the
-                                * entire predicate can be displayed.
-                                */
-                               while (parent_op) {
-                                       if ((parent_op->common.aml_opcode ==
-                                            AML_IF_OP)
-                                           || (parent_op->common.aml_opcode ==
-                                               AML_WHILE_OP)) {
-                                               display_op = parent_op;
-                                               break;
-                                       }
-                                       parent_op = parent_op->common.parent;
-                               }
-                       } else {
-                               while (parent_op) {
-                                       if ((parent_op->common.aml_opcode ==
-                                            AML_IF_OP)
-                                           || (parent_op->common.aml_opcode ==
-                                               AML_ELSE_OP)
-                                           || (parent_op->common.aml_opcode ==
-                                               AML_SCOPE_OP)
-                                           || (parent_op->common.aml_opcode ==
-                                               AML_METHOD_OP)
-                                           || (parent_op->common.aml_opcode ==
-                                               AML_WHILE_OP)) {
-                                               break;
-                                       }
-                                       display_op = parent_op;
-                                       parent_op = parent_op->common.parent;
-                               }
-                       }
-               }
-
                /* Now we can disassemble and display it */
 
 #ifdef ACPI_DISASSEMBLER
-               acpi_dm_disassemble(walk_state, display_op, ACPI_UINT32_MAX);
+               acpi_dm_disassemble(walk_state,
+                                   acpi_db_get_display_op(walk_state, op),
+                                   ACPI_UINT32_MAX);
 #else
                /*
                 * The AML Disassembler is not configured - at least we can