RE: [PATCH v2 6/6] x86/gsseg: use the LKGS instruction if available for load_gs_index()

[Li, Xin3]

> > +       asm_inline volatile("1:\n"
> > +                           ALTERNATIVE("call asm_load_gs_index\n",
> > +                                       _ASM_BYTES(0x3e) LKGS_DI,
> > +                                       X86_FEATURE_LKGS)
> > +                           _ASM_EXTABLE_TYPE_REG(1b, 1b, EX_TYPE_ZERO_REG,
> %k[sel])
> > +                           : ASM_CALL_CONSTRAINT
> > +                           : [sel] "D" (sel)
> 
> DI needs to be marked as input and output (+D), since the exception handler
> modifies it.

Good catch, I accidently removed it from the first version, will add it back.
Xin