Peter Zijlstra wrote:
On Tue, May 24, 2022 at 04:01:48PM +0530, Naveen N. Rao wrote:
We need to know for sure either way. Nop'ing out the _mcount locations at
boot allows us to discover existing long branch trampolines. If we want to
avoid it, we need to note down those locations during build time.
Do you have a different approach in mind?
If you put _mcount in a separate section then the compiler cannot tell
where it is and is forced to always emit a long branch trampoline.
Does that help?
That's an interesting thought. Depending on the type of trampoline the
compiler emits, I might be able to use this approach. We will still need
objtool on powerpc so that we can note down those trampoline locations.
Thanks,
Naveen
