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Add a per pid_namespace child-reaper. This is needed so processes are reaped within the same pid space and do not spill over to the parent pid space. Its also needed so containers preserve existing semantic that pid == 1 would reap orphaned children. This is based on Eric Biederman's patch: http://lkml.org/lkml/2006/2/6/285 Signed-off-by: Sukadev Bhattiprolu <[email protected]> Signed-off-by: Cedric Le Goater <[email protected]> Cc: Kirill Korotaev <[email protected]> Cc: Eric W. Biederman <[email protected]> Cc: Herbert Poetzl <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>