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From: Mel Gorman <mgorman@techsingularity.net>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@kernel.org>, Vlastimil Babka <vbabka@suse.cz>,
	Hugh Dickins <hughd@google.com>, Linux-MM <linux-mm@kvack.org>,
	Linux-RT-Users <linux-rt-users@vger.kernel.org>,
	LKML <linux-kernel@vger.kernel.org>,
	Mel Gorman <mgorman@techsingularity.net>
Subject: [PATCH 1/2] preempt: Provide preempt_*_(no)rt variants
Date: Fri, 23 Jul 2021 11:00:33 +0100	[thread overview]
Message-ID: <20210723100034.13353-2-mgorman@techsingularity.net> (raw)
In-Reply-To: <20210723100034.13353-1-mgorman@techsingularity.net>

From: Thomas Gleixner <tglx@linutronix.de>

RT needs a few preempt_disable/enable points which are not necessary
otherwise. Implement variants to avoid #ifdeffery.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
---
 include/linux/preempt.h | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/include/linux/preempt.h b/include/linux/preempt.h
index 9881eac0698f..3434f4618178 100644
--- a/include/linux/preempt.h
+++ b/include/linux/preempt.h
@@ -184,7 +184,11 @@ do { \
 	preempt_count_dec(); \
 } while (0)
 
-#define preempt_enable_no_resched() sched_preempt_enable_no_resched()
+#ifdef CONFIG_PREEMPT_RT
+# define preempt_enable_no_resched() sched_preempt_enable_no_resched()
+#else
+# define preempt_enable_no_resched() preempt_enable()
+#endif
 
 #define preemptible()	(preempt_count() == 0 && !irqs_disabled())
 
@@ -278,6 +282,18 @@ do { \
 		set_preempt_need_resched(); \
 } while (0)
 
+#ifdef CONFIG_PREEMPT_RT
+# define preempt_disable_rt()		preempt_disable()
+# define preempt_enable_rt()		preempt_enable()
+# define preempt_disable_nort()		barrier()
+# define preempt_enable_nort()		barrier()
+#else
+# define preempt_disable_rt()		barrier()
+# define preempt_enable_rt()		barrier()
+# define preempt_disable_nort()		preempt_disable()
+# define preempt_enable_nort()		preempt_enable()
+#endif
+
 #ifdef CONFIG_PREEMPT_NOTIFIERS
 
 struct preempt_notifier;
-- 
2.26.2


  reply	other threads:[~2021-07-23 10:00 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-23 10:00 [PATCH 0/2] Protect vmstats on PREEMPT_RT Mel Gorman
2021-07-23 10:00 ` Mel Gorman [this message]
2021-07-23 10:00 ` [PATCH 2/2] mm/vmstat: Protect per cpu variables with preempt disable on RT Mel Gorman
2021-08-03 23:54   ` Thomas Gleixner
2021-08-04  9:54     ` Mel Gorman
2021-08-04 13:42       ` Vlastimil Babka
2021-08-04 14:23         ` Mel Gorman
2021-08-05 12:56           ` Thomas Gleixner
2021-08-05 14:04             ` Mel Gorman
2021-08-05 15:42               ` Thomas Gleixner
2021-08-05 18:47               ` Daniel Vacek

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