uprobes: Fold xol_alloc_area() into get_xol_area()
Currently only xol_get_insn_slot() does get_xol_area() + xol_alloc_area(), but this will have more users and we do not want to copy-and-paste this code. This patch simply moves xol_alloc_area() into get_xol_area() to simplify the current and future code. Signed-off-by: Oleg Nesterov <oleg@redhat.com> Acked-by: Anton Arapov <anton@redhat.com> Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
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