Retain all bits of the exit(2) status value

[Jan Engelhardt]

I was made aware of a suggested change to POSIX's exit function.
Current issue 7:
 http://pubs.opengroup.org/onlinepubs/9699919799/functions/exit.html
Proposed change:
 http://austingroupbugs.net/view.php?id=594#c1317
In summary:
 from "the least significant 8 bits (that is, status & 0377)"
 to "the full value shall be available from waitid()"

Now, Linux currently does a & 0xff in kernel/exit.c in the exit and 
exit_group syscalls. I would expect that the proposed change requires a 
new system call, and if so, what should its name be?
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