[PATCH 1/2] srcu: Prevent sdp->srcu_gp_seq_needed_exp counter wrap

[Ildar Ismagilov]

Signed-off-by: Ildar Ismagilov <devi...@gmail.com>
---
 kernel/rcu/srcutree.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/kernel/rcu/srcutree.c b/kernel/rcu/srcutree.c
index 1798d1aa60fa..c54617280245 100644
--- a/kernel/rcu/srcutree.c
+++ b/kernel/rcu/srcutree.c
@@ -552,6 +552,9 @@ static void srcu_gp_end(struct srcu_struct *sp)
                                if (ULONG_CMP_GE(gpseq,
                                                 sdp->srcu_gp_seq_needed + 100))
                                        sdp->srcu_gp_seq_needed = gpseq;
+                               if (ULONG_CMP_GE(gpseq,
+                                                sdp->srcu_gp_seq_needed_exp + 
100))
+                                       sdp->srcu_gp_seq_needed_exp = gpseq;
                                raw_spin_unlock_irqrestore_rcu_node(sdp, flags);
                        }
        }
-- 
2.11.0