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From:   "Uladzislau Rezki (Sony)" <urezki@gmail.com>
To:     LKML <linux-kernel@vger.kernel.org>, RCU <rcu@vger.kernel.org>,
        "Paul E . McKenney" <paulmck@kernel.org>
Cc:     Andrew Morton <akpm@linux-foundation.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Michal Hocko <mhocko@suse.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        "Theodore Y . Ts'o" <tytso@mit.edu>,
        Joel Fernandes <joel@joelfernandes.org>,
        Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
        Uladzislau Rezki <urezki@gmail.com>,
        Oleksiy Avramchenko <oleksiy.avramchenko@sonymobile.com>,
        Ingo Molnar <mingo@redhat.com>,
        Juri Lelli <juri.lelli@redhat.com>,
        Vincent Guittot <vincent.guittot@linaro.org>,
        Dietmar Eggemann <dietmar.eggemann@arm.com>,
        Steven Rostedt <rostedt@goodmis.org>,
        Ben Segall <bsegall@google.com>, Mel Gorman <mgorman@suse.de>,
        Daniel Bristot de Oliveira <bristot@redhat.com>
Subject: [PATCH 09/16] sched: Cleanup PREEMPT_COUNT leftovers
Date:   Thu, 29 Oct 2020 17:50:12 +0100
Message-Id: <20201029165019.14218-9-urezki@gmail.com>
In-Reply-To: <20201029165019.14218-1-urezki@gmail.com>
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From: Thomas Gleixner <tglx@linutronix.de>

CONFIG_PREEMPT_COUNT is now unconditionally enabled and will be
removed. Cleanup the leftovers before doing so.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Juri Lelli <juri.lelli@redhat.com>
Cc: Vincent Guittot <vincent.guittot@linaro.org>
Cc: Dietmar Eggemann <dietmar.eggemann@arm.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Ben Segall <bsegall@google.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Daniel Bristot de Oliveira <bristot@redhat.com>
Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
---
 kernel/sched/core.c | 6 +-----
 lib/Kconfig.debug   | 1 -
 2 files changed, 1 insertion(+), 6 deletions(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index d2003a7d5ab5..e172f2ddfa16 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -3702,8 +3702,7 @@ asmlinkage __visible void schedule_tail(struct task_struct *prev)
 	 * finish_task_switch() for details.
 	 *
 	 * finish_task_switch() will drop rq->lock() and lower preempt_count
-	 * and the preempt_enable() will end up enabling preemption (on
-	 * PREEMPT_COUNT kernels).
+	 * and the preempt_enable() will end up enabling preemption.
 	 */
 
 	rq = finish_task_switch(prev);
@@ -7307,9 +7306,6 @@ void __cant_sleep(const char *file, int line, int preempt_offset)
 	if (irqs_disabled())
 		return;
 
-	if (!IS_ENABLED(CONFIG_PREEMPT_COUNT))
-		return;
-
 	if (preempt_count() > preempt_offset)
 		return;
 
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 03a85065805e..d62806c81f6d 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -1318,7 +1318,6 @@ config DEBUG_LOCKDEP
 
 config DEBUG_ATOMIC_SLEEP
 	bool "Sleep inside atomic section checking"
-	select PREEMPT_COUNT
 	depends on DEBUG_KERNEL
 	help
 	  If you say Y here, various routines which may sleep will become very
-- 
2.20.1