easy question on syscall control flow

[Chris Friesen]

If I drop down from userspace to the kernel to run a syscall, is there any way 
for me to get back to that process' userspace without finishing the syscall (ie 
through signal handlers, etc.)?

I think I'm doing some extra locking that I don't actually need, and I thought 
I'd double-check before removing it.

Thanks,

Chris
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