linux-kernel - Re: linux-next: Tree for June 17 (pci/slot)

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Message-ID: <20090618003808.GA29472@ldl.fc.hp.com>
Date:	Wed, 17 Jun 2009 18:38:08 -0600
From:	Alex Chiang <achiang@...com>
To:	Jesse Barnes <jbarnes@...tuousgeek.org>
Cc:	Randy Dunlap <randy.dunlap@...cle.com>,
	Matthew Wilcox <matthew@....cx>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-next@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	a.beregalov@...il.com
Subject: Re: linux-next: Tree for June 17 (pci/slot)

* Jesse Barnes <jbarnes@...tuousgeek.org>:
> On Wed, 17 Jun 2009 10:43:36 -0700
> Randy Dunlap <randy.dunlap@...cle.com> wrote:
> 
> > Jesse Barnes wrote:
> > > On Wed, 17 Jun 2009 10:36:04 -0600
> > > Matthew Wilcox <matthew@....cx> wrote:
> > > 
> > >> On Wed, Jun 17, 2009 at 09:26:51AM -0700, Randy Dunlap wrote:
> > >>> Stephen Rothwell wrote:
> > >>>> Hi all,
> > >>>>
> > >>>> Changes since 20090616:
> > >>>
> > >>> When CONFIG_SYSFS=n:
> > >>>
> > >>> drivers/pci/slot.c:327: error: 'module_kset' undeclared (first use
> > >>> in this function)
> > >> Is there any point to pci_slot existing without CONFIG_SYSFS?
> > >> I don't see how you can interact with it in any meaningful way.
> > >> Perhaps CONFIG_PCI_SLOT should depend on CONFIG_SYSFS?
> > > 
> > > I've got a code fix queued up, but maybe a Kconfig dependency is the
> > > way to go...
> > 
> > What is the code fix like?
> > The Kconfig fix makes sense to me.
> > 
> > 
> Here's the patch I have (sorry cut & paste):
> 
> Fix this build error when CONFIG_SYSFS is not set:
> drivers/pci/slot.c: In function 'pci_hp_create_module_link':
> drivers/pci/slot.c:327: error: 'module_kset' undeclared
> 
> Signed-off-by: Alexander Beregalov <a.beregalov@...il.com>

I agree with Matthew. You can't do anything useful with the
functionality in drivers/pci/slot.o unless you have sysfs, so a
Kconfig dependency is more appropriate.

From: Alex Chiang <achiang@...com>

PCI: drivers/pci/slot.c should depend on CONFIG_SYSFS

There is no way to interact with a physical PCI slot without
sysfs, so encode the dependency and prevent this build error:

	drivers/pci/slot.c: In function 'pci_hp_create_module_link':
	drivers/pci/slot.c:327: error: 'module_kset' undeclared

Reported-by: Stephen Rothwell <sfr@...b.auug.org.au>
Fix-suggested-by: Matthew Wilcox <matthew@....cx>
Signed-off-by: Alex Chiang <achiang@...com>
---
diff --git a/drivers/pci/Makefile b/drivers/pci/Makefile
index ba6af16..ed32f67 100644
--- a/drivers/pci/Makefile
+++ b/drivers/pci/Makefile
@@ -2,10 +2,11 @@
 # Makefile for the PCI bus specific drivers.
 #
 
-obj-y		+= access.o bus.o probe.o remove.o pci.o quirks.o slot.o \
+obj-y		+= access.o bus.o probe.o remove.o pci.o quirks.o \
 			pci-driver.o search.o pci-sysfs.o rom.o setup-res.o \
 			irq.o
 obj-$(CONFIG_PROC_FS) += proc.o
+obj-$(CONFIG_SYSFS) += slot.o
 
 # Build PCI Express stuff if needed
 obj-$(CONFIG_PCIEPORTBUS) += pcie/
--
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