linux-kernel - [GIT PULL] IRQ updates & fixes

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Date:   Sun, 21 Mar 2021 12:43:15 +0100
From:   Ingo Molnar <mingo@...nel.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Borislav Petkov <bp@...en8.de>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: [GIT PULL] IRQ updates & fixes

Linus,

Please pull the latest irq/urgent git tree from:

   git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git irq-urgent-2021-03-21

   # HEAD: 81e2073c175b887398e5bca6c004efa89983f58d genirq: Disable interrupts for force threaded handlers

A change to robustify force-threaded IRQ handlers to always disable interrupts,
plus a DocBook fix.

[ Note: the force-threaded IRQ handler change has been accelerated 
  from the normal schedule of such a change to keep the bad 
  pattern/workaround of spin_lock_irqsave() in handlers or 
  IRQF_NOTHREAD as a kludge from spreading. ]

 Thanks,

	Ingo

------------------>
Andy Shevchenko (1):
      genirq/irq_sim: Fix typos in kernel doc (fnode -> fwnode)

Thomas Gleixner (1):
      genirq: Disable interrupts for force threaded handlers


 kernel/irq/irq_sim.c | 4 ++--
 kernel/irq/manage.c  | 4 ++++
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/kernel/irq/irq_sim.c b/kernel/irq/irq_sim.c
index 48006608baf0..40880c350b95 100644
--- a/kernel/irq/irq_sim.c
+++ b/kernel/irq/irq_sim.c
@@ -159,7 +159,7 @@ static const struct irq_domain_ops irq_sim_domain_ops = {
  * irq_domain_create_sim - Create a new interrupt simulator irq_domain and
  *                         allocate a range of dummy interrupts.
  *
- * @fnode:      struct fwnode_handle to be associated with this domain.
+ * @fwnode:     struct fwnode_handle to be associated with this domain.
  * @num_irqs:   Number of interrupts to allocate.
  *
  * On success: return a new irq_domain object.
@@ -228,7 +228,7 @@ static void devm_irq_domain_release_sim(struct device *dev, void *res)
  *                              a managed device.
  *
  * @dev:        Device to initialize the simulator object for.
- * @fnode:      struct fwnode_handle to be associated with this domain.
+ * @fwnode:     struct fwnode_handle to be associated with this domain.
  * @num_irqs:   Number of interrupts to allocate
  *
  * On success: return a new irq_domain object.
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index dec3f73e8db9..21ea370fccda 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -1142,11 +1142,15 @@ irq_forced_thread_fn(struct irq_desc *desc, struct irqaction *action)
 	irqreturn_t ret;
 
 	local_bh_disable();
+	if (!IS_ENABLED(CONFIG_PREEMPT_RT))
+		local_irq_disable();
 	ret = action->thread_fn(action->irq, action->dev_id);
 	if (ret == IRQ_HANDLED)
 		atomic_inc(&desc->threads_handled);
 
 	irq_finalize_oneshot(desc, action);
+	if (!IS_ENABLED(CONFIG_PREEMPT_RT))
+		local_irq_enable();
 	local_bh_enable();
 	return ret;
 }