[PATCH v3 0/7] x86: some assembler macro rework

[Jan Beulich <jbeulich@xxxxxxxx>]

Parts of this were discussed in the context of Andrew's CET-SS work.
Further parts simply fit the underlying picture. And a few patches
towards the end get attached here simply because of their dependency.
What is now patch 7 has been moved to the end of the series, in the
hope of at least unblocking the rest.

Most patches in principle have acks / R-b-s which would allow them
to go in. However, there still the controversy on the naming of the
newly introduced header in patch 1 (which subsequent patches then
add to). There hasn't been a name suggestion which would - imo -
truly represent an improvement, and I've explained why I think this
seemingly ambiguous name is actually intentionally very similar to
its sibling's. To prevent this series from further being stuck on
this I'll give it a few more days for better suggestions (or vetos)
to surface, and otherwise commit what I have suitable tags for.

It's also still not really clear to me what - if any - changes to
make to patch 7. As said there I'd be willing to drop some of the
changes made, but not all. Prior discussion hasn't led to a clear
understanding on my part of what's wanted to be kept / dropped. It
could have looked like the entire patch was wanted to go away, but
I don't think I can agree with this.

1: replace __ASM_{CL,ST}AC
2: drop ASM_{CL,ST}AC
3: fold indirect_thunk_asm.h into asm-defns.h
4: guard against straight-line speculation past RET
5: limit amount of INT3 in IND_THUNK_*
6: make guarding against straight-line speculation optional
7: reduce CET-SS related #ifdef-ary

Jan