linux-kernel - Re: [PATCH v11 2/5] usb: renesas-xhci: Add the renesas xhci driver

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Message-ID: <20200430152650.GK948789@vkoul-mobl.Dlink>
Date:   Thu, 30 Apr 2020 20:56:50 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Mathias Nyman <mathias.nyman@...ux.intel.com>,
        Mathias Nyman <mathias.nyman@...el.com>,
        linux-arm-msm@...r.kernel.org,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Christian Lamparter <chunkeey@...glemail.com>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        John Stultz <john.stultz@...aro.org>,
        Alan Stern <stern@...land.harvard.edu>,
        Andreas Böhler <dev@...ehler.at>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v11 2/5] usb: renesas-xhci: Add the renesas xhci driver

On 30-04-20, 16:53, Greg Kroah-Hartman wrote:
> On Thu, Apr 30, 2020 at 08:16:41PM +0530, Vinod Koul wrote:
> > > > diff --git a/drivers/usb/host/Makefile b/drivers/usb/host/Makefile
> > > > index b191361257cc..c3a79f626393 100644
> > > > --- a/drivers/usb/host/Makefile
> > > > +++ b/drivers/usb/host/Makefile
> > > > @@ -70,7 +70,8 @@ obj-$(CONFIG_USB_OHCI_HCD_DAVINCI)	+= ohci-da8xx.o
> > > >  obj-$(CONFIG_USB_UHCI_HCD)	+= uhci-hcd.o
> > > >  obj-$(CONFIG_USB_FHCI_HCD)	+= fhci.o
> > > >  obj-$(CONFIG_USB_XHCI_HCD)	+= xhci-hcd.o
> > > > -obj-$(CONFIG_USB_XHCI_PCI)	+= xhci-pci.o
> > > > +usb-xhci-pci-objs		:= xhci-pci.o xhci-pci-renesas.o
> > > > +obj-$(CONFIG_USB_XHCI_PCI)	+= usb-xhci-pci.o
> > > 
> > > I don't think it's a good idea to rename the xhci-pci module to usb-xhci-pci
> > > 
> > > does
> > > 
> > > xhci-pci-y			:= xhci-pci.o xhci-pci-renesas.o
> > > obj-$(CONFIG_USB_XHCI_PCI)	+= xhci-pci.o
> > > 
> > > cause some kbuild issues?
> > 
> > Yes with this version I get the warning:
> > make[4]: Circular drivers/usb/host/xhci-pci.o <- drivers/usb/host/xhci-pci.o dependency dropped.
> > 
> > I don't speak enough Kbuild, but I guess it does make sense that we have
> > xhci-pci.o as target for both xhci-pci.o xhci-pci-renesas.o! That was
> > the reason for adding usb tag to this to resolve the conflict.
> > 
> > I am okay for any other mechanism which can work well here. Btw what
> > issues do you foresee with adding usb tag to module name.
> 
> It will break all sorts of things.  Happens every time we rename
> modules, let's not do it unless we absolutely have to.

Hmm that is interesting, am not sure why though :)

Anyway, I have fixed it up and was able to make both as modules and
export two symbols for xhci-pci.ko to use :)

Makefile change looks like:

+obj-$(CONFIG_USB_XHCI_PCI)     += xhci-pci.o xhci-pci-renesas.o

Thanks
-- 
~Vinod