Why do we need a new stack? We already have one and it can be used.

We need to step a bit for executing a glibc clone()

v2: Don't lose a page from a child's stack
v3: Remove the defined constant STACK_SIZE
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Acked-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>