Re: [PATCH 9/9] perf tests: Use arch__compare_symbol_names to compare symbols

[Arnaldo Carvalho de Melo]

Em Thu, Feb 15, 2018 at 01:26:35PM +0100, Jiri Olsa escreveu:
> The symbol search called by machine__find_kernel_symbol_by_name
> is using internally arch__compare_symbol_names function to compare
> 2 symbol names, because different archs have different ways of
> comparing symbols. Mostly for skipping '.' prefixes and similar.
> 
> In test 1 when we try to find matching symbols in kallsyms and
> vmlinux, by address and by symbol name. When either is found
> we compare the pair symbol names  by simple strcmp, which is not
> good enough for reasons explained in previous paragraph.
> 
> On powerpc this can cause lockup, because even thought we found
> the pair, the compared names are different and don't match
> simple strcmp. Following code path is executed, that leads
> to lockup:

Added a:

    Fixes: 031b84c407c3 ("perf probe ppc: Enable matching against dot symbols automatically")

And CCed Naveen, the author of that patch, so that gets notified of this
fix.

Thanks,

- Arnaldo