linux-kernel - Re: [PATCH] x86/pci: fix intel_mid_pci.c build error when ACPI is not enabled

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Message-ID: <CAHp75VcJCjJJvbkSiGHC+3_shWRwoqeZHE2KNDLQBjneW=02dg@mail.gmail.com>
Date:   Thu, 13 Aug 2020 23:55:14 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Arjan van de Ven <arjan@...ux.intel.com>
Cc:     Randy Dunlap <rdunlap@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-pci <linux-pci@...r.kernel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Jesse Barnes <jsbarnes@...gle.com>,
        Len Brown <lenb@...nel.org>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>
Subject: Re: [PATCH] x86/pci: fix intel_mid_pci.c build error when ACPI is not enabled

On Thu, Aug 13, 2020 at 11:31 PM Arjan van de Ven <arjan@...ux.intel.com> wrote:
> On 8/13/2020 12:58 PM, Randy Dunlap wrote:
> > From: Randy Dunlap <rdunlap@...radead.org>
> >
> > Fix build error when CONFIG_ACPI is not set/enabled by adding
> > the header file <asm/acpi.h> which contains a stub for the function
> > in the build error.
> >
> > ../arch/x86/pci/intel_mid_pci.c: In function ‘intel_mid_pci_init’:
> > ../arch/x86/pci/intel_mid_pci.c:303:2: error: implicit declaration of function ‘acpi_noirq_set’; did you mean ‘acpi_irq_get’? [-Werror=implicit-function-declaration]
> >    acpi_noirq_set();

Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>
Thanks!

> > Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
> > Cc: Jacob Pan <jacob.jun.pan@...ux.intel.com>
> > Cc: Len Brown <lenb@...nel.org>
> > Cc: Bjorn Helgaas <bhelgaas@...gle.com>
> > Cc: Jesse Barnes <jsbarnes@...gle.com>
> > Cc: Arjan van de Ven <arjan@...ux.intel.com>
> > Cc: linux-pci@...r.kernel.org
> > ---
> > Found in linux-next, but applies to/exists in mainline also.
> >
> > Alternative.1: X86_INTEL_MID depends on ACPI
> > Alternative.2: drop X86_INTEL_MID support
>
> at this point I'd suggest Alternative 2; the products that needed that (past tense, that technology
> is no longer need for any newer products) never shipped in any form where a 4.x or 5.x kernel could
> work, and they are also all locked down...

This is not true. We have Intel Edison which runs nicely on vanilla
(not everything, some is still requiring a couple of patches, but most
of it works out-of-the-box).

And for the record, I have been working on removing quite a pile of
code (~13kLOCs to the date IIRC) in MID area. Just need some time to
fix Edison watchdog for that.

-- 
With Best Regards,
Andy Shevchenko