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[Xen-devel] Re: [patch 13/26] Xen-paravirt_ops: Consistently wrap paravirt ops callsites to make them patchable

On Mon, 19 Mar 2007, Andi Kleen wrote:
> Initially we had some bugs that accounted for near all failures, but they 
> were all fixed in the latest version.

No. The real bugs were that the people involved wouldn't even accept that 
unwinding information was inevitably buggy and/or incomplete.

That much more fundamental bug never got fixed, as far as I know. 

I'm not going to merge anything that depends on unwind tables as things 
stand. The pain just isn't worth it.

> > Please don't subject us to another couple months of hair-pulling only
> > to have Linus yank the thing out again, there are certainly more
> > useful things to spend time on :-)

Good call. Dwarf2 unwinding simply isn't worth doing. But I won't yank it 
out, I simply won't merge it. It was more than just totally buggy code, it 
was an inability of the people to understand that even bugfree code 
isn't enough - you have to be able to also handle buggy data.


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