ACPICA: Add ACPI_MOVE_NAME macro to optimize 4-byte ACPI_NAME copies

Resolves to a 32-bit move for the normal case, strncpy on machines
that do not support misaligned transfers.

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>

1 files changed, 4 insertions, 0 deletions

diff --git a/include/acpi/actypes.h b/include/acpi/actypes.h
index 1fa6ba123071..d1fb674fd393 100644
--- a/include/acpi/actypes.h
+++ b/include/acpi/actypes.h
@@ -453,10 +453,14 @@ typedef u64 acpi_integer;
 #define ACPI_PHYSADDR_TO_PTR(i)         ACPI_TO_POINTER(i)
 #define ACPI_PTR_TO_PHYSADDR(i)         ACPI_TO_INTEGER(i)
 
+/* Optimizations for 4-character (32-bit) acpi_name manipulation */
+
 #ifndef ACPI_MISALIGNMENT_NOT_SUPPORTED
 #define ACPI_COMPARE_NAME(a,b)          (*ACPI_CAST_PTR (u32, (a)) == *ACPI_CAST_PTR (u32, (b)))
+#define ACPI_MOVE_NAME(dest,src)        (*ACPI_CAST_PTR (u32, (dest)) = *ACPI_CAST_PTR (u32, (src)))
 #else
 #define ACPI_COMPARE_NAME(a,b)          (!ACPI_STRNCMP (ACPI_CAST_PTR (char, (a)), ACPI_CAST_PTR (char, (b)), ACPI_NAME_SIZE))
+#define ACPI_MOVE_NAME(dest,src)        (ACPI_STRNCPY (ACPI_CAST_PTR (char, (dest)), ACPI_CAST_PTR (char, (src)), ACPI_NAME_SIZE))
 #endif
 
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