RE: [PATCH 6/6] x86/gsseg: use the LKGS instruction if available for load_gs_index()

[Li, Xin3]

> >> +	alternative_io("1: call asm_load_gs_index\n"
> >> +		       ".pushsection \".fixup\",\"ax\"\n"
> >> +		       "2:	xorl %k[sel], %k[sel]\n"
> >> +		       "	jmp 1b\n"
> >> +		       ".popsection\n"
> >> +		       _ASM_EXTABLE(1b, 2b),
> >> +		       _ASM_BYTES(0x3e) LKGS_DI,
> >> +		       X86_FEATURE_LKGS,
> >> +		       ASM_OUTPUT2([sel] "+D" (sel), ASM_CALL_CONSTRAINT),
> >> +		       ASM_NO_INPUT_CLOBBER(_ASM_AX));
> >>  }
> >
> >I'm very sure none of this was tested... the .fixup section hasn't
> >existed for almost a year now.
> >
> >  e5eefda5aa51 ("x86: Remove .fixup section")
> 
> Xin, what did you use as the forward-porting baseline?

6.0 release, and my kernel dump shows me a fixup section is there, and a fixup section is created anyway if we do "pushsection "\.fixup\"".