[uml-devel] Vmlinux - linux linking stages & /proc/kallsyms empty

[BlaisorBlade <blaisorblade_spam@yahoo.it>]

Jeff, is there any good reason to first link everything in vmlinux and then 
link things properly in linux? Because I have reasons (i.e. bugs) against 
this.

--THE BUGS
**Symptom: /proc/kallsyms is empty. Any stack dump cannot contain the symbol 
names.

**Reason: This because the vmlinux link script is wrong (you rejected the 
patch I sent you time ago, was in the patchset). But kallsyms must contain 
the true addresses of the kernel symbols; since they change between vmlinux 
and linux (if they didn't change, the second step would be useless), they 
cannot be correct. I think that even System.map symbols do not match.

**Fix: So, we actually need to make vmlinux have the correct addresses, i.e. 
avoid the two-pass linking.

--HOW TO FIX THIS: 
You specify the -r flags for vmlinux, so you could as well pass the extra 
objects in and the right link script.

--WHY SHOULD WE BOTHER?
Because it is a fix and it is easy to fix.

Any comments?
-- 
Paolo Giarrusso, aka Blaisorblade
Linux registered user n. 292729



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