linux-kernel - [PATCH 1/2] srcu: Prevent sdp->srcu_gp_seq_needed

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Message-Id: <20180131193954.28386-1-devix84@gmail.com>
Date:   Wed, 31 Jan 2018 22:39:53 +0300
From:   Ildar Ismagilov <devix84@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     devix84@...il.com, "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
        Josh Triplett <josh@...htriplett.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] srcu: Prevent sdp->srcu_gp_seq_needed_exp counter wrap

Signed-off-by: Ildar Ismagilov <devix84@...il.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