SYS_VECTOR_FREE    71 arch/x86/kernel/apic_32.c char system_vectors[NR_VECTORS] = { [0 ... NR_VECTORS-1] = SYS_VECTOR_FREE};
SYS_VECTOR_FREE    92 arch/x86/kernel/io_apic_64.c char system_vectors[NR_VECTORS] = { [0 ... NR_VECTORS-1] = SYS_VECTOR_FREE};
SYS_VECTOR_FREE   331 include/asm-x86/desc.h 	if (system_vectors[vector] == SYS_VECTOR_FREE) {