linux-kernel - [RFC][PATCH 12/11] sched: Add preempt

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Message-ID: <20150929102755.GD3816@twins.programming.kicks-ass.net>
Date:	Tue, 29 Sep 2015 12:27:55 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	mingo@...nel.org
Cc:	linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
	fweisbec@...il.com, oleg@...hat.com, umgwanakikbuti@...il.com,
	tglx@...utronix.de, rostedt@...dmis.org
Subject: [RFC][PATCH 12/11] sched: Add preempt_count invariant check


Ingo requested I keep my debug check for the preempt_count invariant.

Requested-by: Ingo Molnar <mingo@...nel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
---
 kernel/sched/core.c |    5 +++++
 1 file changed, 5 insertions(+)

--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -2503,6 +2503,11 @@ static struct rq *finish_task_switch(str
 	struct mm_struct *mm = rq->prev_mm;
 	long prev_state;
 
+	if (unlikely(WARN_ONCE(preempt_count() != 2,
+			       "corrupted preempt_count: %s/%d/0x%x\n",
+			       current->comm, current->pid, preempt_count())))
+		preempt_count_set(INIT_PREEMPT_COUNT);
+
 	rq->prev_mm = NULL;
 
 	/*
--
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