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From: Steven Rostedt <rostedt@goodmis.org>
To: linux-kernel@vger.kernel.org,
	linux-rt-users <linux-rt-users@vger.kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>,
	Carsten Emde <C.Emde@osadl.org>,
	Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
	John Kacur <jkacur@redhat.com>, Daniel Wagner <wagi@monom.org>,
	Tom Zanussi <zanussi@kernel.org>,
	"Srivatsa S. Bhat" <srivatsa@csail.mit.edu>,
	stable-rt@vger.kernel.org
Subject: [PATCH RT 04/13] preempt: Move preempt_enable_no_resched() to the RT block
Date: Wed, 24 Nov 2021 13:03:07 -0500	[thread overview]
Message-ID: <20211124180326.814388531@goodmis.org> (raw)
In-Reply-To: 20211124180303.574562279@goodmis.org

5.10.78-rt56-rc3 stable review patch.
If anyone has any objections, please let me know.

------------------

From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

preempt_enable_no_resched() should point to preempt_enable() on
PREEMPT_RT so nobody is playing any preempt tricks and enables
preemption without checking for the need-resched flag.

This was misplaced in v3.14.0-rt1 und remained unnoticed until now.

Point preempt_enable_no_resched() and preempt_enable() on RT.

Cc: stable-rt@vger.kernel.org
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
 include/linux/preempt.h | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/include/linux/preempt.h b/include/linux/preempt.h
index af39859f02ee..7b5b2ed55531 100644
--- a/include/linux/preempt.h
+++ b/include/linux/preempt.h
@@ -208,12 +208,12 @@ do { \
 	preempt_count_dec(); \
 } while (0)
 
-#ifdef CONFIG_PREEMPT_RT
+#ifndef CONFIG_PREEMPT_RT
 # define preempt_enable_no_resched() sched_preempt_enable_no_resched()
-# define preempt_check_resched_rt() preempt_check_resched()
+# define preempt_check_resched_rt() barrier();
 #else
 # define preempt_enable_no_resched() preempt_enable()
-# define preempt_check_resched_rt() barrier();
+# define preempt_check_resched_rt() preempt_check_resched()
 #endif
 
 #define preemptible()	(preempt_count() == 0 && !irqs_disabled())
-- 
2.33.0

  parent reply	other threads:[~2021-11-24 18:03 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-11-24 18:03 [PATCH RT 00/13] Linux 5.10.78-rt56-rc3 Steven Rostedt
2021-11-24 18:03 ` [PATCH RT 01/13] mm, zsmalloc: Convert zsmalloc_handle.lock to spinlock_t Steven Rostedt
2021-11-24 18:03 ` [PATCH RT 02/13] sched: Fix get_push_task() vs migrate_disable() Steven Rostedt
2021-11-24 18:03 ` [PATCH RT 03/13] sched: Switch wait_task_inactive to HRTIMER_MODE_REL_HARD Steven Rostedt
2021-11-24 18:03 ` Steven Rostedt [this message]
2021-11-24 18:03 ` [PATCH RT 05/13] mm: Disable NUMA_BALANCING_DEFAULT_ENABLED and TRANSPARENT_HUGEPAGE on PREEMPT_RT Steven Rostedt
2021-11-24 18:03 ` [PATCH RT 06/13] fscache: Use only one fscache_object_cong_wait Steven Rostedt
2021-11-24 18:03 ` [PATCH RT 07/13] fscache: Use only one fscache_object_cong_wait (2) Steven Rostedt
2021-11-24 18:03 ` [PATCH RT 08/13] locking: Drop might_resched() from might_sleep_no_state_check() Steven Rostedt
2021-11-24 18:03 ` [PATCH RT 09/13] drm/i915/gt: Queue and wait for the irq_work item Steven Rostedt
2021-11-24 18:03 ` [PATCH RT 10/13] irq_work: Allow irq_work_sync() to sleep if irq_work() no IRQ support Steven Rostedt
2021-11-24 18:03 ` [PATCH RT 11/13] irq_work: Handle some irq_work in a per-CPU thread on PREEMPT_RT Steven Rostedt
2021-11-24 18:03 ` [PATCH RT 12/13] irq_work: Also rcuwait for !IRQ_WORK_HARD_IRQ " Steven Rostedt
2021-11-24 18:03 ` [PATCH RT 13/13] Linux 5.10.78-rt56-rc3 Steven Rostedt

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