|To:||Thomas Gleixner <firstname.lastname@example.org>|
|Subject:||Re: [patch 3/5] MIPS: Octeon: Simplify irq_cpu_on/offline irq chip functions|
|From:||David Daney <email@example.com>|
|Date:||Sun, 27 Mar 2011 17:24:38 -0700|
|Cc:||Ralf Baechle <firstname.lastname@example.org>, David Daney <email@example.com>, firstname.lastname@example.org|
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On 03/27/2011 02:29 PM, Thomas Gleixner wrote:
On Sun, 27 Mar 2011, David Daney wrote:On 03/27/2011 09:22 AM, Thomas Gleixner wrote:Make use of the IRQCHIP_ONOFFLINE_ENABLED flag and remove the wrappers. Use irqd_irq_disabled() instead of desc->status, which will go away.I rewrote my patch set and was testing it. Interesting that I came up with a function with almost the same name and purpose. However my function told us if the irq was masked *or* disabled. The idea being a function that returns true if the irq could fire. We cannot be enabling the interrupt in the controller if it is masked. For example I need to test this when adjusting affinity, and taking CPUs on and off line. I don't think your genirq changes can tell the me information I really need in their current state. I think we need to consider how the masked state interacts with IRQCHIP_ONOFFLINE_ENABLED and irqd_irq_disabled(). Since I have totally rewritten my interrupt code, I am a bit ambivalent about applying these patches. It might make more sense that I adjust my patch for your genirq changes and test it before committing it.The modifications I made are 100% equivalent to the code you provided in the first place.
Acknowledged.However subsequently, I made mostly equivalent changes. The main difference is that I added IRQS_MASKED into the mix testing it in addition to IRQS_DISABLED
The IRQCHIP_ONOFFLINE_ENABLED flag is only used for the on/offline callbacks. The disabled checked based on irq_data is in the affinity setting code. Unless I'm missing something we should be all set.
As I mentioned in the other e-mail, I am concerned that some of the chip functions may get called when the desc is in a IRQS_MASKED istate.
If we can prevent calling .irq_cpu_online when IRQS_MASKED is set that might be good.
Perhaps adding a flag similar to IRQCHIP_ONOFFLINE_ENABLED, to disable calling .irq_set_affinity when the irq shouldn't be enabled.
With something like that, I think we can get rid of all the checks in the irq_chip functions.
Thanks, David Daney
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