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genirq: Fix misleading synchronize_irq() documentation
author
Thomas Gleixner
<tglx@linutronix.de>
Fri, 28 Jun 2019 11:11:50 +0000
(13:11 +0200)
committer
Greg Kroah-Hartman
<gregkh@linuxfoundation.org>
Sun, 21 Jul 2019 07:03:12 +0000
(09:03 +0200)
commit
1d21f2af8571c6a6a44e7c1911780614847b0253
upstream
The function might sleep, so it cannot be called from interrupt
context. Not even with care.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Link:
https://lkml.kernel.org/r/20190628111440.189241552@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
kernel/irq/manage.c
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diff --git
a/kernel/irq/manage.c
b/kernel/irq/manage.c
index
5c76ed5
..
f8214bb
100644
(file)
--- 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)
{