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genirq: stackdump after the "Trying to free already-free IRQ" message

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these bugs are harder to find than they seem, a stackdump helps.

make it dependent on CONFIG_DEBUG_SHIRQ so that people can turn it off
if it annoys them.

Signed-off-by: Ingo Molnar <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
This commit is contained in:
Ingo Molnar 2008-01-30 13:33:24 +01:00
commit 70edcd77a0
1 changed files with 3 additions and 0 deletions
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3
kernel/irq/manage.c
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@ -479,6 +479,9 @@ void free_irq(unsigned int irq, void *dev_id)
return;
}
printk(KERN_ERR "Trying to free already-free IRQ %d\n", irq);
#ifdef CONFIG_DEBUG_SHIRQ
dump_stack();
#endif
spin_unlock_irqrestore(&desc->lock, flags);
return;
}