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Re: [Xen-devel] Re: [patch 13/26] Xen-paravirt_ops: Consistently wrap pa

To: Andi Kleen <ak@xxxxxxx>
Subject: Re: [Xen-devel] Re: [patch 13/26] Xen-paravirt_ops: Consistently wrap paravirt ops callsites to make them patchable
From: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Date: Tue, 20 Mar 2007 16:51:19 -0700 (PDT)
Cc: jeremy@xxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxx, David Miller <davem@xxxxxxxxxxxxx>, netdev@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, jbeulich@xxxxxxxxxx, virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx, chrisw@xxxxxxxxxxxx, virtualization@xxxxxxxxxxxxxx, "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>, anthony@xxxxxxxxxxxxx, mingo@xxxxxxx, akpm@xxxxxxxxxxxxxxxxxxxx, Alan Cox <alan@xxxxxxxxxxxxxxxxxxx>
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On Tue, 20 Mar 2007, Andi Kleen wrote:
> 
> Linus is worried about the unwinder crashing -- that wouldn't help with that.

And to make it clear: this is not a theoretical worry. It happened many 
times over the months the unwinder was in. 

It was supposed to help debugging, but it made bugs that *would* have been 
nicely debuggable without it into nightmares. So the only reason for it 
existing in the first place was actually the thing that made it not work.

                Linus

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