diff options
| author | Lv Zheng <lv.zheng@intel.com> | 2016-03-24 09:40:56 +0800 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2016-04-05 03:53:33 +0200 |
| commit | a8d1e1c063b0b1c91a9415f5cb09e37a75bce809 (patch) | |
| tree | a7b90d0700afc06d868a4283c897f02aa2d5289c | |
| parent | 7447bc1e69bafab72ef69a7f054bb1e5f9ff908d (diff) | |
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 <lv.zheng@intel.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
| -rw-r--r-- | drivers/acpi/acpica/acmacros.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/acpi/acpica/acmacros.h b/drivers/acpi/acpica/acmacros.h index 411c18b7d541..b461f5568e8c 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. |