arch/arm64/include/asm/linkage.h - linux/torvalds/linux - Git at Google

 #ifndef __ASM_LINKAGE_H
 #define __ASM_LINKAGE_H

 #define __ALIGN		.align 2
 #define __ALIGN_STR	".align 2"

 #endif
	#ifndef __ASM_LINKAGE_H
	#define __ASM_LINKAGE_H

	#define __ALIGN .align 2
	#define __ALIGN_STR ".align 2"

	#endif