./arch/x86/kernel/smpboot.c: asm/spec-ctrl.h is included more than once. In the following kernel version: name: linux-next url:https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git branch: next-20231006 commit: 0f0fe5040de5e5fd9b040672e37725b046e312f0