Re: [PATCH RFC 0/3] Static calls

[Peter Zijlstra]

On Fri, Nov 09, 2018 at 02:50:27PM +0100, Ard Biesheuvel wrote:
> On 9 November 2018 at 08:28, Ingo Molnar <mingo@xxxxxxxxxx> wrote:
> >> - I'm not sure about the objtool approach.  Objtool is (currently)
> >>   x86-64 only, which means we have to use the "unoptimized" version
> >>   everywhere else.  I may experiment with a GCC plugin instead.
> >
> > I'd prefer the objtool approach. It's a pretty reliable first-principles
> > approach while GCC plugin would have to be replicated for Clang and any
> > other compilers, etc.
> >
> 
> I implemented the GCC plugin approach here for arm64

I'm confused; I though we only needed objtool for variable instruction
length architectures, because we can't reliably decode our instruction
stream. Otherwise we can fairly trivially use the DWARF relocation data,
no?