[PATCH 4.9 30/88] ACPICA: Introduce ACPI_ACCESS_BYTE_WIDTH() macro

[Greg Kroah-Hartman]

From: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>

commit 1dade3a7048ccfc675650cd2cf13d578b095e5fb upstream.

Sometimes it is useful to find the access_width field value in bytes and
not in bits so add a helper that can be used for this purpose.

Suggested-by: Jean Delvare <jdelvare@xxxxxxx>
Signed-off-by: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>
Reviewed-by: Jean Delvare <jdelvare@xxxxxxx>
Cc: 4.16+ <stable@xxxxxxxxxxxxxxx> # 4.16+
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 include/acpi/actypes.h |    2 ++
 1 file changed, 2 insertions(+)

--- a/include/acpi/actypes.h
+++ b/include/acpi/actypes.h
@@ -551,6 +551,8 @@ typedef u64 acpi_integer;
 #define ACPI_VALIDATE_RSDP_SIG(a)       (!strncmp (ACPI_CAST_PTR (char, (a)), ACPI_SIG_RSDP, 8))
 #define ACPI_MAKE_RSDP_SIG(dest)        (memcpy (ACPI_CAST_PTR (char, (dest)), ACPI_SIG_RSDP, 8))
 
+#define ACPI_ACCESS_BYTE_WIDTH(size)    (1 << ((size) - 1))
+
 /*******************************************************************************
  *
  * Miscellaneous constants