Re: [PATCH 2/3] objtool: Ignore retpoline alternatives

[Peter Zijlstra]

On Thu, Jan 11, 2018 at 10:33:26AM -0600, Josh Poimboeuf wrote:
> On Thu, Jan 11, 2018 at 04:27:38PM +0000, David Woodhouse wrote:
> > On Wed, 2018-01-10 at 19:48 -0600, Josh Poimboeuf wrote:
> > > 
> > > +#define ANNOTATE_NOSPEC_ALTERNATIVE                            \
> > > +       "999:\n\t"                                              \
> > > +       ".pushsection .discard.nospec\n\t"                      \
> > > +       ".long 999b - .\n\t"                                    \
> > > +       ".popsection\n\t"
> > > +
> > 
> > <mode name="peterz">
> >   Ick, numbers. Use .Lfoo_%= instead.
> > </mode>
> 
> I seem to recall that not working with inline asm, maybe old versions of
> GCC don't like it or something?  I can try it and see if 0-day bot
> complains.

Note that we'll raise the GCC limit to 4.5 soon to mandate asm-goto, for
x86 at least.