Frederic,

On Tue, Nov 24 2020 at 01:13, Frederic Weisbecker wrote:

On Tue, Nov 24, 2020 at 01:06:15AM +0100, Thomas Gleixner wrote:

quoted

Good point. Haven't thought about that. Let me have a look again.

But I'm cooking a patchset which moves account_irq_enter_time() after
HARDIRQ_OFFSET or SOFTIRQ_OFFSET is incremented. This will allow us to move
tick_irq_enter() under this layout:

		 preempt_count_add(HARDIRQ_OFFSET)
		 lockdep_hardirq_enter()
		 tick_irq_enter()
		 account_irq_enter_time()

This way tick_irq_enter() can be correctly handled by lockdep and we can remove
the nasty hack which temporarily disables softirqs around it.

And as a side effect it should also fix your issue.

I should have that ready soonish.

Sounds to good to be true :)

Looking forward to it!

Thanks for taking care of that!

       tglx

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