Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-12-14 15:13:52 +00:00
Code Issues Packages Projects Releases Wiki Activity

ACPICA: Utilities: Add ACPI_IS_POWER_OF_TWO()

Browse Source 
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>
This commit is contained in:
Lv Zheng 2016-03-24 09:40:56 +08:00 committed by Rafael J. Wysocki
parent 7447bc1e69
commit a8d1e1c063
1 changed files with 4 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/acpi/acpica/acmacros.h
View File

@ -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.