Pull x86 fixes from Ingo Molnar:

 - Fix a NOP-patching bug that resulted in valid but suboptimal
   NOP sequences in certain cases

 - Fix build warnings related to fall-through control flow

* tag 'x86-urgent-2024-05-18' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/alternatives: Use the correct length when optimizing NOPs
  x86/boot: Address clang -Wimplicit-fallthrough in vsprintf()
  x86/boot: Add a fallthrough annotation