linux-kernel - Re: [PATCH 1/2] EHCI : introduce a common ehci

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Date:	Sun, 3 Jul 2011 23:02:20 +0200
From:	matthieu castet <castet.matthieu@...e.fr>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Linux Kernel list <linux-kernel@...r.kernel.org>,
	<linux-usb@...r.kernel.org>
Subject: Re: [PATCH 1/2] EHCI : introduce a common ehci_setup

Le Sat, 2 Jul 2011 16:35:15 -0400 (EDT),
Alan Stern <stern@...land.harvard.edu> a écrit :

> On Sat, 2 Jul 2011, Matthieu CASTET wrote:
> 
> > This allow to clean duplicated code in most of SOC driver.
> > 
> > Signed-off-by: Matthieu CASTET <castet.matthieu@...e.fr>
> > ---
> >  drivers/usb/host/ehci-hcd.c |   29 +++++++++++++++++++++++++++++
> >  1 files changed, 29 insertions(+), 0 deletions(-)
> > 
> > diff --git a/drivers/usb/host/ehci-hcd.c
> > b/drivers/usb/host/ehci-hcd.c index f8030ee..f990b0f 100644
> > --- a/drivers/usb/host/ehci-hcd.c
> > +++ b/drivers/usb/host/ehci-hcd.c
> > @@ -763,6 +763,35 @@ static int ehci_run (struct usb_hcd *hcd)
> >  	return 0;
> >  }
> >  
> > +static int __maybe_unused ehci_setup (struct usb_hcd *hcd)
> > +{
> > +	struct ehci_hcd *ehci = hcd_to_ehci(hcd);
> > +	int retval;
> 
> ...
> 
> > +}
> > +
> 
> Instead of putting this routine in ehci-hcd.c, where it will silently 
> use up unnecessary codespace on thousands or millions of desktop 
> systems, why not put it into a new separate source file?  Then the
> SOC drivers can #include that file.
Ok if you prefer that.
But if we allow someday to built more than one
SOC driver at a time (this will come for distribution doing generic arm
kernel or case like [1]). How it will work ? 

Also because the function is static, the compiler will remove
it, if it is not used. So it won't use extra codespace on desktop.


Matthieu


[1] http://marc.info/?l=linux-usb&m=130831671316362&w=2
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