kernel_optimize_test/arch/x86/include/asm/alternative-asm.h

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#ifdef __ASSEMBLY__
#include <asm/asm.h>
#ifdef CONFIG_SMP
.macro LOCK_PREFIX
1: lock
.section .smp_locks,"a"
.balign 4
.long 1b - .
.previous
.endm
#else
.macro LOCK_PREFIX
.endm
#endif
#endif /* __ASSEMBLY__ */