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Message-Id: <20220519145823.618983-3-frederic@kernel.org>
Date: Thu, 19 May 2022 16:58:04 +0200
From: Frederic Weisbecker <frederic@...nel.org>
To: LKML <linux-kernel@...r.kernel.org>
Cc: Frederic Weisbecker <frederic@...nel.org>,
Peter Zijlstra <peterz@...radead.org>,
Phil Auld <pauld@...hat.com>,
Alex Belits <abelits@...vell.com>,
Nicolas Saenz Julienne <nsaenz@...nel.org>,
Xiongfeng Wang <wangxiongfeng2@...wei.com>,
Neeraj Upadhyay <quic_neeraju@...cinc.com>,
Thomas Gleixner <tglx@...utronix.de>,
Yu Liao <liaoyu15@...wei.com>,
Boqun Feng <boqun.feng@...il.com>,
"Paul E . McKenney" <paulmck@...nel.org>,
Marcelo Tosatti <mtosatti@...hat.com>,
Paul Gortmaker <paul.gortmaker@...driver.com>,
Uladzislau Rezki <uladzislau.rezki@...y.com>,
Joel Fernandes <joel@...lfernandes.org>,
Mark Rutland <mark.rutland@....com>
Subject: [PATCH 02/21] rcu: Tag rcu_irq_*_irqson() as noinstr
rcu_irq_*_irqson() functions can't be safely instrumented. Since they
enter/exit to/from RCU idle mode, those functions must be tagged as
"noinstr".
Unfortunately this involves converting the instrumentable
local_irq_save()/local_irq_restore() to their raw counterparts. Precious
debugging informations might be lost on the way until a better way out
is found.
Signed-off-by: Frederic Weisbecker <frederic@...nel.org>
Cc: Paul E. McKenney <paulmck@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Neeraj Upadhyay <quic_neeraju@...cinc.com>
Cc: Uladzislau Rezki <uladzislau.rezki@...y.com>
Cc: Joel Fernandes <joel@...lfernandes.org>
Cc: Boqun Feng <boqun.feng@...il.com>
Cc: Nicolas Saenz Julienne <nsaenz@...nel.org>
Cc: Marcelo Tosatti <mtosatti@...hat.com>
Cc: Xiongfeng Wang <wangxiongfeng2@...wei.com>
Cc: Yu Liao<liaoyu15@...wei.com>
Cc: Phil Auld <pauld@...hat.com>
Cc: Paul Gortmaker<paul.gortmaker@...driver.com>
Cc: Alex Belits <abelits@...vell.com>
---
kernel/rcu/tree.c | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 02233b17cce0..ff97264d8077 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -843,13 +843,13 @@ void rcu_irq_exit_check_preempt(void)
* If you add or remove a call to rcu_irq_exit_irqson(), be sure to test
* with CONFIG_RCU_EQS_DEBUG=y.
*/
-void rcu_irq_exit_irqson(void)
+void noinstr rcu_irq_exit_irqson(void)
{
unsigned long flags;
- local_irq_save(flags);
+ raw_local_irq_save(flags);
rcu_irq_exit();
- local_irq_restore(flags);
+ raw_local_irq_restore(flags);
}
/*
@@ -1081,13 +1081,13 @@ noinstr void rcu_irq_enter(void)
* If you add or remove a call to rcu_irq_enter_irqson(), be sure to test
* with CONFIG_RCU_EQS_DEBUG=y.
*/
-void rcu_irq_enter_irqson(void)
+void noinstr rcu_irq_enter_irqson(void)
{
unsigned long flags;
- local_irq_save(flags);
+ raw_local_irq_save(flags);
rcu_irq_enter();
- local_irq_restore(flags);
+ raw_local_irq_restore(flags);
}
/*
--
2.25.1
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