is_REX_prefix 261 arch/x86/kernel/kprobes.c if (is_REX_prefix(insn)) is_REX_prefix 302 arch/x86/kernel/kprobes.c if (is_REX_prefix(insn)) is_REX_prefix 778 arch/x86/kernel/kprobes.c if (is_REX_prefix(insn))