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ACPICA: Utilities: Add ACPI_IS_POWER_OF_TWO()

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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: 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>
This commit is contained in:
Lv Zheng 2016-03-24 09:40:56 +08:00 • committed by Rafael J. Wysocki
commit a8d1e1c063
1 changed files with 4 additions and 0 deletions
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4
drivers/acpi/acpica/acmacros.h
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@ -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.