Messages in this thread Patch in this message | | | From | Lv Zheng <> | Subject | [PATCH 21/30] ACPICA: Utilities: Add ACPI_IS_POWER_OF_TWO() | Date | Thu, 24 Mar 2016 09:40:56 +0800 |
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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> --- 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 411c18b..b461f55 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. -- 1.7.10
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