linux-kernel - Re: [PATCH 3/3] Revert "ACPI,PCI,IRQ: remove SCI penalize function"

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Date:   Tue, 4 Oct 2016 09:23:30 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Sinan Kaya <okaya@...eaurora.org>
cc:     linux-acpi@...r.kernel.org, rjw@...ysocki.net, bhelgaas@...gle.com,
        ravikanth.nalla@....com, linux@...nbow-software.org,
        timur@...eaurora.org, cov@...eaurora.org, jcm@...hat.com,
        alex.williamson@...hat.com, linux-pci@...r.kernel.org,
        agross@...eaurora.org, linux-arm-msm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, wim@....tudelft.nl,
        Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] Revert "ACPI,PCI,IRQ: remove SCI penalize
 function"

On Sat, 1 Oct 2016, Sinan Kaya wrote:

> This reverts commit 9e5ed6d1fb87 ("ACPI,PCI,IRQ: remove SCI penalize
> function"). SCI penalty API was replaced by the runtime penalty calculation
> based on the value of acpi_gbl_FADT.sci_interrupt.

This does more than only reverting said commit ....
 
> acpi_gbl_FADT.sci_interrupt type does not get updated at the right time
> for some platforms and results in incorrect penalty assignment for PCI
> IRQs as irq_get_trigger_type returns the wrong type.

And the obvious question is: Why does irq_get_trigger_type() return the
wrong type?

What's the root cause of this problem? Your changelog does not tell
anything.

Thanks,

	tglx