Re: [PATCH] perf report: auto-detect branch stack sampling mode

[Ingo Molnar]

* Arnaldo Carvalho de Melo <acme@xxxxxxxxxx> wrote:

> > Something like this seems to do it for me.
> > 
> >         offset = addr - sym->start;
> > +       len = sym->end - sym->start;
> > +       if (offset >= len)
> > +               return 0;
> > +
> 
> That is my fault, I should have added a BUG_ON() spitting out 
> a callchain in this case, as that function shouldn't be called 
> if the address is not within its range :-\

Btw., I'd suggest not doing a BUG_ON() but some less destructive 
warning: both symbol table errors and sample stream hickups are 
common and can lead to essentially arbitrary input data - we 
shouldn't crash on that.

Thanks,

	Ingo
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/