ACPICA: Interpreter: Add warning if 64-bit constant appears in 32-bit table.
Some ASL compilers allow 64-bit constants within a 32-bit table
(DSDT version == 1). When encountered, emit a warning that the
constant will be truncated to 32 bits. This is potentially a
serious problem in the ACPI table(s).
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
diff --git a/drivers/acpi/acpica/dsobject.c b/drivers/acpi/acpica/dsobject.c
index 13844a1..82050bc 100644
--- a/drivers/acpi/acpica/dsobject.c
+++ b/drivers/acpi/acpica/dsobject.c
@@ -703,7 +703,7 @@
/* Truncate value if we are executing from a 32-bit ACPI table */
#ifndef ACPI_NO_METHOD_EXECUTION
- acpi_ex_truncate_for32bit_table(obj_desc);
+ (void)acpi_ex_truncate_for32bit_table(obj_desc);
#endif
break;
@@ -725,8 +725,18 @@
case AML_TYPE_LITERAL:
obj_desc->integer.value = op->common.value.integer;
+
#ifndef ACPI_NO_METHOD_EXECUTION
- acpi_ex_truncate_for32bit_table(obj_desc);
+ if (acpi_ex_truncate_for32bit_table(obj_desc)) {
+
+ /* Warn if we found a 64-bit constant in a 32-bit table */
+
+ ACPI_WARNING((AE_INFO,
+ "Truncated 64-bit constant found in 32-bit table: %8.8X%8.8X => %8.8X",
+ ACPI_FORMAT_UINT64(op->common.
+ value.integer),
+ (u32)obj_desc->integer.value));
+ }
#endif
break;