linux-kernel - Re: [PATCH v2] usb/xhci: fix compilation warning when !CONFIG_PCI && !CONFIG

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Message-ID: <20140321214123.GB10097@psi-dev26.jf.intel.com>
Date:	Fri, 21 Mar 2014 14:41:23 -0700
From:	David Cohen <david.a.cohen@...ux.intel.com>
To:	Felipe Balbi <balbi@...com>, mathias.nyman@...ux.intel.com
Cc:	gregkh@...uxfoundation.org, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] usb/xhci: fix compilation warning when !CONFIG_PCI &&
 !CONFIG_PM

Hi Mathias,

On Tue, Feb 18, 2014 at 11:04:12AM -0800, David Cohen wrote:
> On Tue, Feb 18, 2014 at 12:47:41PM -0600, Felipe Balbi wrote:
> > On Tue, Feb 18, 2014 at 10:00:30AM -0800, David Cohen wrote:
> > > Hi Sarah,
> > > 
> > > On Mon, Jan 06, 2014 at 07:02:19PM -0800, David Cohen wrote:
> > > > When CONFIG_PCI and CONFIG_PM are not selected, xhci.c gets this
> > > > warning:
> > > > drivers/usb/host/xhci.c:409:13: warning: ‘xhci_msix_sync_irqs’ defined
> > > > but not used [-Wunused-function]
> > > > 
> > > > It happens due to lack of __maybe_unused flag on xhci_msix_sync_irqs()
> > > > function in case of !CONFIG_PCI.
> > > > 
> > > > Signed-off-by: David Cohen <david.a.cohen@...ux.intel.com>
> > > > ---
> > > 
> > > Ping :)
> > > Any comments here?
> > > 
> > > Br, David
> > > 
> > > > 
> > > > Change v1 -> v2:
> > > >  - xhci_msix_sync_irqs() already uses __maybe_unused flag when CONFIG_PCI is
> > > >    set. Proper solution is to add same flag when !CONFIG_PCI instead of define
> > > >    function as inline.
> > > > 
> > > >  drivers/usb/host/xhci.c | 2 +-
> > > >  1 file changed, 1 insertion(+), 1 deletion(-)
> > > > 
> > > > diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
> > > > index 4265b48856f6..ed6b717b8ee1 100644
> > > > --- a/drivers/usb/host/xhci.c
> > > > +++ b/drivers/usb/host/xhci.c
> > > > @@ -406,7 +406,7 @@ static void xhci_cleanup_msix(struct xhci_hcd *xhci)
> > > >  {
> > > >  }
> > > >  
> > > > -static void xhci_msix_sync_irqs(struct xhci_hcd *xhci)
> > > > +static void __maybe_unused xhci_msix_sync_irqs(struct xhci_hcd *xhci)
> > 
> > bellow is likely a better fix. Usually stubs are marked inline, rather
> > than getting an unused attribute:
> 
> Thanks for commenting. That would be actually the v1 of my patch :)
> I changed after I see the proper function has __maybe_unused flag.
> 
> But I'm fine with Sarah picking any of the patch's versions.

Guess you're handling the review of this trivial patch now :)
Comments are very welcome.

Br, David

> 
> Br, David
> 
> > 
> > diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
> > index 3712359..8f1a6d5 100644
> > --- a/drivers/usb/host/xhci.c
> > +++ b/drivers/usb/host/xhci.c
> > @@ -404,16 +404,16 @@ static int xhci_try_enable_msi(struct usb_hcd *hcd)
> >  
> >  #else
> >  
> > -static int xhci_try_enable_msi(struct usb_hcd *hcd)
> > +static inline int xhci_try_enable_msi(struct usb_hcd *hcd)
> >  {
> >  	return 0;
> >  }
> >  
> > -static void xhci_cleanup_msix(struct xhci_hcd *xhci)
> > +static inline void xhci_cleanup_msix(struct xhci_hcd *xhci)
> >  {
> >  }
> >  
> > -static void xhci_msix_sync_irqs(struct xhci_hcd *xhci)
> > +static inline void xhci_msix_sync_irqs(struct xhci_hcd *xhci)
> >  {
> >  }
> >  
> > 
> > -- 
> > balbi
> 
> 
> 
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