uprobes: Kill the bogus IS_ERR_VALUE(xol_vaddr) check

utask->xol_vaddr is either zero or valid, remove the bogus
IS_ERR_VALUE() check in xol_free_insn_slot().

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Anton Arapov <anton@redhat.com>
Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>

diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index 071edcb..f6c7062 100644 (file)
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -1223,8 +1223,7 @@ static void xol_free_insn_slot(struct task_struct *tsk)
                return;
 
        slot_addr = tsk->utask->xol_vaddr;
-
-       if (unlikely(!slot_addr || IS_ERR_VALUE(slot_addr)))
+       if (unlikely(!slot_addr))
                return;
 
        area = tsk->mm->uprobes_state.xol_area;