[PATCH RFC] itrace probe point problem on ppc64: unknown symbol 'access_process_vm'

[Maynard Johnson]

Hi,
As I mentioned in my previous post today, besides the need for updating runtime/itrace.c to use the new utrace interface, I found another problem when trying to use the itrace probe point on ppc64 -- I got an "unknown symbol" error for 'access_process_vm' when systemtap tried to insert the generated kernel module.  Turns out that on the ppc64 kernel for Fedora, this symbol isn't exported.  :-(  I've gotten around this by simply pasting the access_process_vm code into runtime/itrace.c and renaming it to avoid a clash when using on Fedora/x86_64 (where this kernel function *is* exported).  The attached patch shows this change.  Is this an acceptable way to handle this problem?  Or does someone have a better idea?

Thanks.
-Maynard
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