linux-kernel - Re: [PATCH v1 1/3] bus: mhi: core: Remove warnings for missing MODULE

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Message-ID: <20200918171809.GA3410@Mani-XPS-13-9360>
Date:   Fri, 18 Sep 2020 22:48:09 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     bbhatt@...eaurora.org
Cc:     Jeffrey Hugo <jhugo@...eaurora.org>, linux-arm-msm@...r.kernel.org,
        hemantk@...eaurora.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 1/3] bus: mhi: core: Remove warnings for missing
 MODULE_LICENSE()

On Fri, Sep 18, 2020 at 09:49:05AM -0700, bbhatt@...eaurora.org wrote:
> On 2020-09-18 07:27, Jeffrey Hugo wrote:
> > On 9/17/2020 4:19 PM, Bhaumik Bhatt wrote:
> > > When building MHI as a module, missing MODULE_LICENSE() warnings
> > > are seen. Avoid them by adding the license and description
> > > information for the files where the warnings are seen.
> > > 
> > > Signed-off-by: Bhaumik Bhatt <bbhatt@...eaurora.org>
> > > ---
> > >   drivers/bus/mhi/core/boot.c | 3 +++
> > >   drivers/bus/mhi/core/main.c | 3 +++
> > >   drivers/bus/mhi/core/pm.c   | 3 +++
> > >   3 files changed, 9 insertions(+)
> > > 
> > > diff --git a/drivers/bus/mhi/core/boot.c b/drivers/bus/mhi/core/boot.c
> > > index 24422f5..78140cc 100644
> > > --- a/drivers/bus/mhi/core/boot.c
> > > +++ b/drivers/bus/mhi/core/boot.c
> > > @@ -523,3 +523,6 @@ void mhi_fw_load_handler(struct mhi_controller
> > > *mhi_cntrl)
> > >   error_alloc_fw_table:
> > >   	release_firmware(firmware);
> > >   }
> > > +
> > > +MODULE_LICENSE("GPL v2");
> > > +MODULE_DESCRIPTION("MHI Host Interface");
> > > diff --git a/drivers/bus/mhi/core/main.c b/drivers/bus/mhi/core/main.c
> > > index 2cff5dd..172026f 100644
> > > --- a/drivers/bus/mhi/core/main.c
> > > +++ b/drivers/bus/mhi/core/main.c
> > > @@ -1533,3 +1533,6 @@ int mhi_poll(struct mhi_device *mhi_dev, u32
> > > budget)
> > >   	return ret;
> > >   }
> > >   EXPORT_SYMBOL_GPL(mhi_poll);
> > > +
> > > +MODULE_LICENSE("GPL v2");
> > > +MODULE_DESCRIPTION("MHI Host Interface");
> > > diff --git a/drivers/bus/mhi/core/pm.c b/drivers/bus/mhi/core/pm.c
> > > index ce4d969..72c3dbc 100644
> > > --- a/drivers/bus/mhi/core/pm.c
> > > +++ b/drivers/bus/mhi/core/pm.c
> > > @@ -1150,3 +1150,6 @@ void mhi_device_put(struct mhi_device *mhi_dev)
> > >   	read_unlock_bh(&mhi_cntrl->pm_lock);
> > >   }
> > >   EXPORT_SYMBOL_GPL(mhi_device_put);
> > > +
> > > +MODULE_LICENSE("GPL v2");
> > > +MODULE_DESCRIPTION("MHI Host Interface");
> > > 
> > 
> > I would expect you only need to add the MODULE_* once per module, in
> > which case main.c is probably the only place that needs it.
> 
> Hi Jeff,
> 
> I thought so too. This is to fix below warnings seen when building MHI as a
> MODULE:
> 
> WARNING: modpost: missing MODULE_LICENSE() in drivers/bus/mhi/core/main.o
> WARNING: modpost: missing MODULE_LICENSE() in drivers/bus/mhi/core/pm.o
> WARNING: modpost: missing MODULE_LICENSE() in drivers/bus/mhi/core/boot.o
> 
> We've only had those in init.c so far.
> 

Can you please test below diff to see if it fixes the warning?

diff --git a/drivers/bus/mhi/core/Makefile b/drivers/bus/mhi/core/Makefile
index 66e2700c9032..bc1469778cf8 100644
--- a/drivers/bus/mhi/core/Makefile
+++ b/drivers/bus/mhi/core/Makefile
@@ -1,3 +1,3 @@
-obj-$(CONFIG_MHI_BUS) := mhi.o
+obj-$(CONFIG_MHI_BUS) += mhi.o
 
 mhi-y := init.o main.o pm.o boot.o

Thanks,
Mani

> Thanks,
> Bhaumik
> 
> 'The Qualcomm Innovation Center, Inc. is a member of the Code Aurora
> Forum,\na Linux Foundation Collaborative Project'