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From: "peterz at infradead dot org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/102952] New code-gen options for retpolines and straight
 line speculation
Date: Thu, 28 Oct 2021 07:43:57 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102952

--- Comment #21 from peterz at infradead dot org ---
(In reply to H.J. Lu from comment #19)
> Created attachment 51685 [details]
> The v4 patch to add -mharden-sls=3D

I seem to have found one 'funny':

kernel/bpf/core.o: warning: objtool: ___bpf_prog_run()+0x23: unreachable
instruction

  27e6:       48 8b 14 d5 00 00 00    mov    0x0(,%rdx,8),%rdx
  27ed:       00
       27ea: R_X86_64_32S      .rodata..c_jump_table
  27ee:       e9 00 00 00 00          jmp    27f3 <___bpf_prog_run+0x23>
       27ef: R_X86_64_PLT32    __x86_indirect_thunk_rdx-0x4
  27f3:       cc                      int3
  27f4:       cc                      int3
  27f5:       8b 53 04                mov    0x4(%rbx),%edx


Other than that, it seems I need to go clean up our asm ...=