From: Thomas Gleixner <tglx@linutronix.de>
To: LKML <linux-kernel@vger.kernel.org>
Cc: x86@kernel.org, Marc Zyngier <marc.zyngier@arm.com>
Subject: [patch V2 2/6] genirq: Fix misleading synchronize_irq() documentation
Date: Fri, 28 Jun 2019 13:11:50 +0200 [thread overview]
Message-ID: <20190628111440.189241552@linutronix.de> (raw)
In-Reply-To: <20190628111148.828731433@linutronix.de>
The function might sleep, so it cannot be called from interrupt
context. Not even with care.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
kernel/irq/manage.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -96,7 +96,8 @@ EXPORT_SYMBOL(synchronize_hardirq);
* to complete before returning. If you use this function while
* holding a resource the IRQ handler may need you will deadlock.
*
- * This function may be called - with care - from IRQ context.
+ * Can only be called from preemptible code as it might sleep when
+ * an interrupt thread is associated to @irq.
*/
void synchronize_irq(unsigned int irq)
{
next prev parent reply other threads:[~2019-06-28 11:21 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-28 11:11 [patch V2 0/6] x86/irq: Cure various interrupt issues Thomas Gleixner
2019-06-28 11:11 ` [patch V2 1/6] genirq: Delay deactivation in free_irq() Thomas Gleixner
2019-07-03 8:16 ` [tip:x86/apic] " tip-bot for Thomas Gleixner
2019-06-28 11:11 ` Thomas Gleixner [this message]
2019-07-01 14:53 ` [patch V2 2/6] genirq: Fix misleading synchronize_irq() documentation Peter Zijlstra
2019-07-01 18:01 ` Thomas Gleixner
2019-07-01 18:23 ` Peter Zijlstra
2019-07-03 8:16 ` [tip:x86/apic] " tip-bot for Thomas Gleixner
2019-06-28 11:11 ` [patch V2 3/6] genirq: Add optional hardware synchronization for shutdown Thomas Gleixner
2019-07-01 8:48 ` Marc Zyngier
2019-07-01 14:56 ` Peter Zijlstra
2019-07-01 18:02 ` Thomas Gleixner
2019-07-03 8:17 ` [tip:x86/apic] " tip-bot for Thomas Gleixner
2019-06-28 11:11 ` [patch V2 4/6] x86/ioapic: Implement irq_get_irqchip_state() callback Thomas Gleixner
2019-07-03 8:18 ` [tip:x86/apic] " tip-bot for Thomas Gleixner
2019-06-28 11:11 ` [patch V2 5/6] x86/irq: Handle spurious interrupt after shutdown gracefully Thomas Gleixner
2019-07-03 8:18 ` [tip:x86/apic] " tip-bot for Thomas Gleixner
2019-06-28 11:11 ` [patch V2 6/6] x86/irq: Seperate unused system vectors from spurious entry again Thomas Gleixner
2019-07-03 8:19 ` [tip:x86/apic] " tip-bot for Thomas Gleixner
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