From b87e6f1836f9285eaac15b3c5db75c9b4c957bef Mon Sep 17 00:00:00 2001
From: Phil Auld <pauld@redhat.com>
Date: Wed, 5 Aug 2020 16:31:38 -0400
Subject: [PATCH] sched: Fix use of count for nr_running tracepoint

References: bnc#1155798 (CPU scheduler functional and performance backports)
Patch-mainline: v5.9-rc1
Git-commit: a1bd06853ee478d37fae9435c5521e301de94c67

The count field is meant to tell if an update to nr_running
is an add or a subtract. Make it do so by adding the missing
minus sign.

Fixes: 9d246053a691 ("sched: Add a tracepoint to track rq->nr_running")
Signed-off-by: Phil Auld <pauld@redhat.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20200805203138.1411-1-pauld@redhat.com
Signed-off-by: Mel Gorman <mgorman@suse.de>
---
 kernel/sched/sched.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 23c4c996c06a..ce40c622cab6 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -1962,7 +1962,7 @@ static inline void sub_nr_running(struct rq *rq, unsigned count)
 {
 	rq->nr_running -= count;
 	if (trace_sched_update_nr_running_tp_enabled()) {
-		call_trace_sched_update_nr_running(rq, count);
+		call_trace_sched_update_nr_running(rq, -count);
 	}
 
 	/* Check if we still need preemption */