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TIL: ALIGN in Linux kernel

2018-09-06

kernel, Linux

Tags:

bitwise, TIL

louie.lu

from include/uapi/linux/kernel.h and scripts/dtc/dtc.h

#define __ALIGN_KERNEL(x, a) __ALIGN_KERNEL_MASK(x, (typeof(x))a – 1)
#define __ALIGN_KERNEL_MASK(x, mask) (((x) + (mask)) & ~(mask))

or

#define ALIGN(x, a) (((x) + (a) – 1) & ~((a) – 1))

#define __ALIGN_KERNEL(x, a) __ALIGN_KERNEL_MASK(x, (typeof(x))a – 1)

#define __ALIGN_KERNEL_MASK(x, mask) (((x) + (mask)) & ~(mask))

#define ALIGN(x, a) (((x) + (a) – 1) & ~((a) – 1))

TIL: ALIGN in Linux kernel

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