Re: [PATCH] remove LOCK_SECTION from x86_64 spin_lock asm

[Andi Kleen]

On Thu, Sep 16, 2004 at 09:44:31AM +0200, Ingo Molnar wrote:
> 
> * Andi Kleen <ak@xxxxxxx> wrote:
> 
> > Something is mixed up here:
> > 
> > The whole problem only happens on kernels using frame pointer. I never
> > saw it, simply because I don't use frame pointers.
> >
> > On a frame pointer less kernel profiling works just fine, and with
> > this fix it should work the same on a FP kernel.
> 
> it only works on pointer less kernels because the spinlock profile 
> unwinding is _conditional_ on an FP kernel right now:

Actually my idea doesn't work  because there is a one instruction
race where rbp is not set up on the stack yet. I think I give up and just save
%rbp in this case.

-Andi
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