linux-kernel - Re: [PATCH V2] acpi, pci, irq: account for early penalty assignment

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Date:	Thu, 3 Mar 2016 09:10:48 -0600
From:	Bjorn Helgaas <helgaas@...nel.org>
To:	Sinan Kaya <okaya@...eaurora.org>
Cc:	linux-acpi@...r.kernel.org, timur@...eaurora.org,
	cov@...eaurora.org, linux-pci@...r.kernel.org,
	ravikanth.nalla@....com, lenb@...nel.org, harish.k@....com,
	ashwin.reghunandanan@....com, bhelgaas@...gle.com,
	rjw@...ysocki.net, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2] acpi, pci, irq: account for early penalty assignment

On Thu, Mar 03, 2016 at 09:48:09AM -0500, Sinan Kaya wrote:
> Taking another stab at it.
> 
> On 3/2/2016 10:14 PM, Sinan Kaya wrote:
> > Taking a step back here and also some inspiration from your code, why don't we
> > fix the actual problem instead of redesigning the whole thing?
> 
> I read your email multiple times. I think you want to move the x86 specific pieces
> (ISA interrupts and its command line arguments) out of the drivers\acpi\pci_link.c.
> Is this right?

That was my idea, but your minimal patch from last night looks awfully
attractive, and maybe it's not worth moving it to arch/x86.  I do think we
could simplify the code significantly by getting rid of the kzalloc and
acpi_irq_penalty_list from acpi_irq_set_penalty().  How about pushing on
that a little bit first, and see what it looks like then?

> - the legacy ISA IRQs, i.e., the contents of acpi_irq_isa_penalty[]
> - acpi_irq_isa= from command line
> 
>  int pcibios_irq_penalty(int irq)
>   {
>     if (irq >= ACPI_MAX_ISA_IRQ)
>       return 0;
> 
>     return acpi_irq_isa_penalty[irq] + acpi_irq_cmd_line_penalty[irq];
>   }
> 
> 
> -- 
> Sinan Kaya
> Qualcomm Technologies, Inc. on behalf of Qualcomm Innovation Center, Inc.
> Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project
> --
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