Messages in this thread | | | Date | Tue, 22 Apr 2014 09:46:57 -0400 | From | Steven Rostedt <> | Subject | Re: BUG: spinlock trylock failure on UP, i.MX28 3.12.15-rt25 |
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[ added Peter ]
On Tue, 22 Apr 2014 13:54:39 +0200 Sebastian Andrzej Siewior <bigeasy@linutronix.de> wrote:
> this is, erm, harmless. We grab the timer lock via trylock in hardirq > context. If the lock is already taken then we fail to get it we go for > plan B. According to lockdep a trylock should not fail on UP. This is > true in general except for this timer case. I was thinking abour > disabling this lockdep check…
trylock not failing on UP, can that be an issue? I mean, if a hardirq does a trylock to see if it can grab a lock that is not protected by disabling irqs, and will go to plan B if it fails, on UP, it will always get it. But the issue is still there. That would mean that a hardirq could have preempted a critical section and doing a trylock here would succeed when it really should have failed.
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