linux-kernel - Re: [PATCH 4/4] xhci: Allow xHCI drivers to be built as separate modules

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Date:	Mon, 14 Jul 2014 10:20:52 -0700
From:	Andrew Bresticker <abrestic@...omium.org>
To:	Julius Werner <jwerner@...omium.org>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Mathias Nyman <mathias.nyman@...el.com>,
	Alan Stern <stern@...land.harvard.edu>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>
Subject: Re: [PATCH 4/4] xhci: Allow xHCI drivers to be built as separate modules

On Thu, Jul 10, 2014 at 11:34 AM, Julius Werner <jwerner@...omium.org> wrote:
>> diff --git a/drivers/usb/host/Makefile b/drivers/usb/host/Makefile
>> index af89a90..bafba71 100644
>> --- a/drivers/usb/host/Makefile
>> +++ b/drivers/usb/host/Makefile
>> @@ -15,19 +15,19 @@ fhci-$(CONFIG_FHCI_DEBUG) += fhci-dbg.o
>>  xhci-hcd-y := xhci.o xhci-mem.o
>>  xhci-hcd-y += xhci-ring.o xhci-hub.o xhci-dbg.o
>>  xhci-hcd-y += xhci-trace.o
>> -xhci-hcd-$(CONFIG_PCI) += xhci-pci.o
>>
>> -ifneq ($(CONFIG_USB_XHCI_PLATFORM), )
>> -       xhci-hcd-y              += xhci-plat.o
>> +xhci-plat-hcd-y := xhci-plat.o
>>  ifneq ($(CONFIG_USB_XHCI_MVEBU), )
>> -       xhci-hcd-y              += xhci-mvebu.o
>> -endif
>
> nit: Can do this even simpler now, just
> "xhci-plat-hcd-$(CONFIG_USB_XHCI_MVEBU) += xhci-mvebu.o" without the
> ifneq.

Nope - since CONFIG_USB_XHCI_MVEBU can be 'y' or 'm' we need the ifneq
here (which matches against both) to ensure xhci-mvebu.o is built is
part of xhci-plat-hcd.o.
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