linux-kernel - Re: [usb-storage] [PATCH 23/24] usb: change to new flag variable

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Date:	Fri, 24 Sep 2010 13:28:23 -0700
From:	matt mooney <mfm@...eddisk.com>
To:	Matthew Dharm <mdharm-kernel@...-eyed-alien.net>
Cc:	kernel-janitors@...r.kernel.org,
	David Brownell <dbrownell@...rs.sourceforge.net>,
	usb-storage@...ts.one-eyed-alien.net,
	Greg Kroah-Hartman <gregkh@...e.de>,
	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
	Felipe Balbi <felipe.balbi@...ia.com>,
	David Vrabel <david.vrabel@....com>,
	Michal Marek <mmarek@...e.cz>
Subject: Re: [usb-storage] [PATCH 23/24] usb: change to new flag variable

On 13:02 Fri 24 Sep     , Matthew Dharm wrote:
> On Fri, Sep 24, 2010 at 12:17:33PM -0700, matt mooney wrote:
> > Replace EXTRA_CFLAGS with ccflags-y.
> 
> > diff --git a/drivers/usb/storage/Makefile b/drivers/usb/storage/Makefile
> > index ef7e5a8..786f086 100644
> > --- a/drivers/usb/storage/Makefile
> >
+++ b/drivers/usb/storage/Makefile
> > @@ -5,7 +5,7 @@
> >  # Rewritten to use lists instead of if-statements.
> >  #
> >  
> > -EXTRA_CFLAGS	:= -Idrivers/scsi
> > +ccflags-y	:= -Idrivers/scsi
> >  
> >  obj-$(CONFIG_USB_STORAGE)	+= usb-storage.o
> 
> I don't really know anything about the new 'ccflags' stuff.. but my
> instincts tell me that perhaps that should be
> 'ccflags-$(CONFIG_USB_STORAGE)' rather than 'ccflags-y'?

The flag has the same effect as EXTRA_CFLAGS in that it will be used to build
all  sources at the same hierarchical level (i.e., per directory not including
subdirectories). I didn't want to change the semantics of the way the variable
was being used, but after looking at the Kconfig it seems that would be a
reasonable change. If only usb-storage needs the flag then it makes sense,
though it seems that everything else in the directory relies on usb-storage
anyway, but it gives it greater meaning knowing that only usb-storage relies on
the flag, IMHO.

> 
> Does it make a difference that usb-storage can be built-in or a loadable
> module?

That would make a difference because ccflags-m is not used, so the change is not
possible.

-mfm

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