Re: [PATCH] perf: Fix symbol resolution on old ppc64 ABI

[Ingo Molnar]

* Anton Blanchard <anton@xxxxxxxxx> wrote:

> The synthetic symbol creation code has an issue with the old ppc64 
> ABI. We end up with duplicate symbols of different sizes that 
> overlap.
> 
> To fix this, walk all of the symbols and remove any duplicates that 
> are the length of a function descriptor.

> I'd prefer not to add a ppc64 specific hack here, but I'm not sure 
> how we can fix this in a simpler way.

Symbol space problems are common on other architectures as well.

We could use a heuristic: when symbols are overlapping then we could 
throw away the one that is smaller. This would implicitly cover the 
ppc64 case, right?

I'd also suggest we warn somewhere that a symbol has been thrown 
away, if verbosity is turned off. (i.e. don't warn by default.)

Thanks,

	Ingo
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