sys_exit: NR 0 (was "sys_exit: NR -1")

[Paul Clarke]

I'm seeing another asymmetry, this one is on powerpc:
--
  perf 30179 [001] 10374622.667436: raw_syscalls:sys_enter: NR 11 
(3fffe16ef55e, [...])
    ls 30179 [002] 10374622.667921:  raw_syscalls:sys_exit: NR 0 = 0
--

Syscall "11" is "execve", but is it expected that the sys_exit will report the 
ID as 0?  Is that because of the nature of "execve", to overlay the entire 
contents of the process?

This does not seem to occur on x86.

PC