linux-kernel - Re: [PATCH v5 1/3] xhci: hub: export symbol on xhci_hub

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Date:   Fri, 28 Oct 2022 08:04:54 +0200
From:   "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
To:     Jim Lin <jilin@...dia.com>
Cc:     Jonathan Hunter <jonathanh@...dia.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
        "thierry.reding@...il.com" <thierry.reding@...il.com>,
        "mathias.nyman@...el.com" <mathias.nyman@...el.com>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>
Subject: Re: [PATCH v5 1/3] xhci: hub: export symbol on xhci_hub_control

On Fri, Oct 28, 2022 at 05:36:41AM +0000, Jim Lin wrote:
> On Thu, 2022-10-27 at 15:58 +0200, Greg KH wrote:
> > External email: Use caution opening links or attachments
> > 
> > 
> > On Thu, Oct 27, 2022 at 09:31:25PM +0800, Jim Lin wrote:
> > > Add EXPORT_SYMBOL_GPL on xhci_hub_control() for other driver module
> > > to invoke and avoid linking error.
> > 
> > What other driver module?
> > 
> > There is no user here :(
> > 
> > confused,
> > 
> 
> In arch/arm/configs/multi_v7_defconfig
> It defines
> CONFIG_USB_XHCI_TEGRA=m
> 
> If I don't add EXPORT_SYMBOL_GPL on xhci_hub_control()
> , I will get compile/linking error like
> 
> ERROR: modpost: "xhci_hub_control" [drivers/usb/host/xhci-tegra.ko]
> undefined!
> 
> if patch
> "[PATCH v5,3/3] xhci: tegra: USB2 pad power controls"
> 
> https://patchwork.kernel.org/project/linux-usb/patch/20221027133127.27592-4-jilin@nvidia.com/
> is added in xhci-tegra.c to invoke xhci_hub_control()
> 
> Should I integrate this patch with [PATCH v5,3/3] as one?

Yes, do not add something that is not needed for that specific commit,
otherwise it causes reviewers to be confused.

thanks,

greg k-h