Re: [PATCH] x86/alternative: Drop smp_locks glue

[Mike Rapoport]

On Sat, Jun 13, 2026 at 11:56:32AM -0700, Borislav Petkov wrote:
> From: "Borislav Petkov (AMD)" <bp@xxxxxxxxx>
> Date: Sat, 13 Jun 2026 10:15:27 -0700
> 
> This was there to be able to patch out locking instructions when running
> a SMP kernel build on a UP CPU. The times are long gone when single-CPU
> x86 machines were relevant so drop that machinery and simplify the code
> considerably.
> 
> LOCK_PREFIX needs to stay for when one wants to do a UP build for
> whatever reason. That'll go away when CONFIG_SMP becomes unconditional.
> 
> Kill a bunch of leftover, unused prototypes while at it.
> 
> Signed-off-by: Borislav Petkov (AMD) <bp@xxxxxxxxx>

FWIW:
Acked-by: Mike Rapoport (Microsoft) <rppt@xxxxxxxxxx>

> ---
>  arch/um/kernel/um_arch.c           |  12 --
>  arch/x86/include/asm/alternative.h |  47 +------
>  arch/x86/include/asm/cmpxchg_32.h  |   4 +-
>  arch/x86/kernel/alternative.c      | 190 -----------------------------
>  arch/x86/kernel/kprobes/core.c     |   3 -
>  arch/x86/kernel/kprobes/opt.c      |   1 -
>  arch/x86/kernel/module.c           |  13 +-
>  arch/x86/kernel/smpboot.c          |   3 -
>  arch/x86/kernel/vmlinux.lds.S      |  12 --
>  arch/x86/tools/relocs.c            |   2 +-
>  tools/objtool/check.c              |   1 -
>  tools/objtool/klp-diff.c           |   1 -
>  12 files changed, 9 insertions(+), 280 deletions(-)

-- 
Sincerely yours,
Mike.