stack_used() not accurate?

[Mike Snitzer]

Hi,

When I use the attached script for all ext3 call-chains stack_used()
is _always_ 481.  I'm running the latest systemtap.git on an RHEL5
x86_64 system (though older versions of systemtap showed the same
481).

I've tested switching the module from ext3 to others and 481 doesn't change.

Looking at tapset/context.stp the implementation for stack_used()
looks fine.  But given the constant 481 I'm seeing is systemtap
somehow showing systemtap-tainted stack usage?

Mike
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