linux-kernel - Re: [PATCH v3 14/17] PCI: dwc: artpec6: Add support for endpoint mode

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Date:   Fri, 3 Nov 2017 11:23:32 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Niklas Cassel <niklas.cassel@...s.com>
Cc:     Bjorn Helgaas <bhelgaas@...gle.com>,
        Jesper Nilsson <jespern@...s.com>,
        Kishon Vijay Abraham I <kishon@...com>,
        Jingoo Han <jingoohan1@...il.com>,
        Shawn Guo <shawn.guo@...aro.org>,
        Peter Robinson <pbrobinson@...il.com>,
        Xiaowei Song <songxiaowei@...ilicon.com>,
        linux-pci <linux-pci@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arm-kernel@...s.com
Subject: Re: [PATCH v3 14/17] PCI: dwc: artpec6: Add support for endpoint mode

On Fri, Nov 3, 2017 at 10:56 AM, Niklas Cassel <niklas.cassel@...s.com> wrote:
> On 11/02/2017 10:13 AM, Arnd Bergmann wrote:

>>
>>
>> Can you try replacing the #ifdef with
>>
>>
>>         if (!IS_ENABLED(CONFIG_PCIE_ARTPEC6_HOST))
>>                  return -ENODEV;
>>
>> at the start of artpec6_pcie_enable_interrupts? I think that would improve
>> readability here.
>>
>
> artpec6_pcie_enable_interrupts is a void function, so
> I guess that you meant at the start of artpec6_add_pcie_port.

Right, sorry about that.

> That would not really help since artpec6_add_pcie_port
> calls artpec6_pcie_msi_handler, and uses artpec6_pcie_host_ops,
> which is still inside the CONFIG_PCIE_ARTPEC6_HOST ifdef block.
>
> Please note that there are several functions, as well as
> artpec6_pcie_host_ops inside the
> CONFIG_PCIE_ARTPEC6_HOST ifdef block.

What I meant is that you can remove the #ifdef entirely if you add

         if (!IS_ENABLED(CONFIG_PCIE_ARTPEC6_HOST))
                  return -ENODEV;

to artpec6_pcie_probe(). Anything after that statement will get
silently dropped by the compiler, including static functions and
structures that are referenced indirectly from there.

      Arnd