From a8d1e1c063b0b1c91a9415f5cb09e37a75bce809 Mon Sep 17 00:00:00 2001 From: Lv Zheng Date: Thu, 24 Mar 2016 09:40:56 +0800 Subject: [PATCH] ACPICA: Utilities: Add ACPI_IS_POWER_OF_TWO() ACPICA commit cbcb77565c5032dd48e19b3a8a8b8704c5f29faf This patch adds a macro ACPI_IS_POWER_OF_TWO, which can be used to detect if a number is a power of two. Lv Zheng. Link: https://github.com/acpica/acpica/commit/cbcb7756 Signed-off-by: Lv Zheng Signed-off-by: Bob Moore Signed-off-by: Rafael J. Wysocki --- drivers/acpi/acpica/acmacros.h | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/acpi/acpica/acmacros.h b/drivers/acpi/acpica/acmacros.h index 411c18b7d541c..b461f5568e8c4 100644 --- a/drivers/acpi/acpica/acmacros.h +++ b/drivers/acpi/acpica/acmacros.h @@ -260,6 +260,10 @@ #define ACPI_IS_MISALIGNED(value) (((acpi_size) value) & (sizeof(acpi_size)-1)) +/* Generic (power-of-two) rounding */ + +#define ACPI_IS_POWER_OF_TWO(a) (((a) & ((a) - 1)) == 0) + /* * Bitmask creation * Bit positions start at zero.