[PATCH tip/core/rcu 08/15] sched: Cleanup PREEMPT_COUNT leftovers

paulmck
2020-09-28T23:31:53Z

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: Paul E. McKenney <paulmck@kernel.org>
---
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 2d95dc3..1c304a1 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -3706,8 +3706,7 @@ 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);
@@ -7308,9 +7307,6 @@ 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 d4d0574..52af6ad 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -1320,7 +1320,6 @@ 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
--
2.9.5