linux-kernel - [PATCH RT 3/8] preempt: Move preempt_enable_no

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Date:   Wed,  1 Dec 2021 14:41:03 -0600
From:   zanussi@...nel.org
To:     LKML <linux-kernel@...r.kernel.org>,
        linux-rt-users <linux-rt-users@...r.kernel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Carsten Emde <C.Emde@...dl.org>,
        John Kacur <jkacur@...hat.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Daniel Wagner <wagi@...om.org>,
        Clark Williams <williams@...hat.com>,
        "Luis Claudio R. Goncalves" <lgoncalv@...hat.com>,
        Tom Zanussi <zanussi@...nel.org>
Cc:     stable-rt@...r.kernel.org
Subject: [PATCH RT 3/8] preempt: Move preempt_enable_no_resched() to the RT block

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

v5.4.161-rt67-rc1 stable review patch.
If anyone has any objections, please let me know.

-----------


[ Upstream commit 1a45b3551ef852193c3d338888132c4925d0690d ]

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@...r.kernel.org
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Signed-off-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
Signed-off-by: Tom Zanussi <zanussi@...nel.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 adb085fe31e4..bbc3592b6f04 100644
--- a/include/linux/preempt.h
+++ b/include/linux/preempt.h
@@ -211,12 +211,12 @@ 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())
-- 
2.17.1