Listing probe alias resolution failures

[Stone, Joshua I]

David Smith wrote:
> I guess I was thinking that the "optionalness" of vm.mmap would have 
> meant that when do_mmap wasn't found, vm.mmap would be tossed (so that 
> there would be no attempt to look up $addr and $len)

This is exactly right.  But in this case, do_mmap *is* found, so the 
"optionalness" resolves to a real probe point.  If you add a "-vv" to 
your command line, you'll see which probe points get resolved.  Once you 
have a probe point, then it has to resolve the body, so the parameters 
become an issue.

I think Frank had an idea for conditional target variables a while back, 
but I can't find the email.  Perhaps that's an idea that needs to be 
revived?

> Perhaps the real bug is that the kernel.function("do_mmap") should be 
> made optional in the vm.mmap probe alias.

I think in this case do_mmap is found, so the only bug is #1155 
resolving inline parameters...


Josh