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Message-ID: <20250313155914.342607279@linutronix.de>
Date: Thu, 13 Mar 2025 16:59:53 +0100 (CET)
From: Thomas Gleixner <tglx@...utronix.de>
To: LKML <linux-kernel@...r.kernel.org>
Cc: Peter Zijlstra <peterz@...radead.org>,
Jiri Slaby <jirislaby@...nel.org>
Subject: [patch 07/46] genirq/spurious: Cleanup code
Clean up the coding style
No functional change.
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
kernel/irq/spurious.c | 74 ++++++++++++++++++--------------------------------
1 file changed, 28 insertions(+), 46 deletions(-)
--- a/kernel/irq/spurious.c
+++ b/kernel/irq/spurious.c
@@ -34,8 +34,9 @@ static atomic_t irq_poll_active;
* true and let the handler run.
*/
bool irq_wait_for_poll(struct irq_desc *desc)
- __must_hold(&desc->lock)
{
+ lockdep_assert_held(&desc->lock);
+
if (WARN_ONCE(irq_poll_cpu == smp_processor_id(),
"irq poll in progress on cpu %d for irq %d\n",
smp_processor_id(), desc->irq_data.irq))
@@ -157,8 +158,7 @@ static void poll_spurious_irqs(struct ti
continue;
/* Racy but it doesn't matter */
- state = desc->istate;
- barrier();
+ state = READ_ONCE(desc->istate);
if (!(state & IRQS_SPURIOUS_DISABLED))
continue;
@@ -168,8 +168,7 @@ static void poll_spurious_irqs(struct ti
}
out:
atomic_dec(&irq_poll_active);
- mod_timer(&poll_spurious_irq_timer,
- jiffies + POLL_SPURIOUS_IRQ_INTERVAL);
+ mod_timer(&poll_spurious_irq_timer, jiffies + POLL_SPURIOUS_IRQ_INTERVAL);
}
static inline int bad_action_ret(irqreturn_t action_ret)
@@ -195,15 +194,12 @@ static void __report_bad_irq(struct irq_
struct irqaction *action;
unsigned long flags;
- if (bad_action_ret(action_ret)) {
- printk(KERN_ERR "irq event %d: bogus return value %x\n",
- irq, action_ret);
- } else {
- printk(KERN_ERR "irq %d: nobody cared (try booting with "
- "the \"irqpoll\" option)\n", irq);
- }
+ if (bad_action_ret(action_ret))
+ pr_err("irq event %d: bogus return value %x\n", irq, action_ret);
+ else
+ pr_err("irq %d: nobody cared (try booting with the \"irqpoll\" option)\n", irq);
dump_stack();
- printk(KERN_ERR "handlers:\n");
+ pr_err("handlers:\n");
/*
* We need to take desc->lock here. note_interrupt() is called
@@ -213,11 +209,10 @@ static void __report_bad_irq(struct irq_
*/
raw_spin_lock_irqsave(&desc->lock, flags);
for_each_action_of_desc(desc, action) {
- printk(KERN_ERR "[<%p>] %ps", action->handler, action->handler);
+ pr_err("[<%p>] %ps", action->handler, action->handler);
if (action->thread_fn)
- printk(KERN_CONT " threaded [<%p>] %ps",
- action->thread_fn, action->thread_fn);
- printk(KERN_CONT "\n");
+ pr_cont(" threaded [<%p>] %ps", action->thread_fn, action->thread_fn);
+ pr_cont("\n");
}
raw_spin_unlock_irqrestore(&desc->lock, flags);
}
@@ -232,18 +227,17 @@ static void report_bad_irq(struct irq_de
}
}
-static inline int
-try_misrouted_irq(unsigned int irq, struct irq_desc *desc,
- irqreturn_t action_ret)
+static inline bool try_misrouted_irq(unsigned int irq, struct irq_desc *desc,
+ irqreturn_t action_ret)
{
struct irqaction *action;
if (!irqfixup)
- return 0;
+ return false;
/* We didn't actually handle the IRQ - see if it was misrouted? */
if (action_ret == IRQ_NONE)
- return 1;
+ return true;
/*
* But for 'irqfixup == 2' we also do it for handled interrupts if
@@ -251,19 +245,16 @@ try_misrouted_irq(unsigned int irq, stru
* traditional PC timer interrupt.. Legacy)
*/
if (irqfixup < 2)
- return 0;
+ return false;
if (!irq)
- return 1;
+ return true;
/*
* Since we don't get the descriptor lock, "action" can
- * change under us. We don't really care, but we don't
- * want to follow a NULL pointer. So tell the compiler to
- * just load it once by using a barrier.
+ * change under us.
*/
- action = desc->action;
- barrier();
+ action = READ_ONCE(desc->action);
return action && (action->flags & IRQF_IRQPOLL);
}
@@ -273,8 +264,7 @@ void note_interrupt(struct irq_desc *des
{
unsigned int irq;
- if (desc->istate & IRQS_POLL_INPROGRESS ||
- irq_settings_is_polled(desc))
+ if (desc->istate & IRQS_POLL_INPROGRESS || irq_settings_is_polled(desc))
return;
if (bad_action_ret(action_ret)) {
@@ -420,13 +410,12 @@ void note_interrupt(struct irq_desc *des
/*
* Now kill the IRQ
*/
- printk(KERN_EMERG "Disabling IRQ #%d\n", irq);
+ pr_emerg("Disabling IRQ #%d\n", irq);
desc->istate |= IRQS_SPURIOUS_DISABLED;
desc->depth++;
irq_disable(desc);
- mod_timer(&poll_spurious_irq_timer,
- jiffies + POLL_SPURIOUS_IRQ_INTERVAL);
+ mod_timer(&poll_spurious_irq_timer, jiffies + POLL_SPURIOUS_IRQ_INTERVAL);
}
desc->irqs_unhandled = 0;
}
@@ -436,11 +425,9 @@ bool noirqdebug __read_mostly;
int noirqdebug_setup(char *str)
{
noirqdebug = 1;
- printk(KERN_INFO "IRQ lockup detection disabled\n");
-
+ pr_info("IRQ lockup detection disabled\n");
return 1;
}
-
__setup("noirqdebug", noirqdebug_setup);
module_param(noirqdebug, bool, 0644);
MODULE_PARM_DESC(noirqdebug, "Disable irq lockup detection when true");
@@ -452,12 +439,10 @@ static int __init irqfixup_setup(char *s
return 1;
}
irqfixup = 1;
- printk(KERN_WARNING "Misrouted IRQ fixup support enabled.\n");
- printk(KERN_WARNING "This may impact system performance.\n");
-
+ pr_warn("Misrouted IRQ fixup support enabled.\n");
+ pr_warn("This may impact system performance.\n");
return 1;
}
-
__setup("irqfixup", irqfixup_setup);
module_param(irqfixup, int, 0644);
@@ -468,11 +453,8 @@ static int __init irqpoll_setup(char *st
return 1;
}
irqfixup = 2;
- printk(KERN_WARNING "Misrouted IRQ fixup and polling support "
- "enabled\n");
- printk(KERN_WARNING "This may significantly impact system "
- "performance\n");
+ pr_warn("Misrouted IRQ fixup and polling support enabled\n");
+ pr_warn("This may significantly impact system performance\n");
return 1;
}
-
__setup("irqpoll", irqpoll_setup);
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