linux-kernel - Re: [PATCH] Export functions from pcie-designware

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Date:	Tue, 16 Sep 2014 17:38:41 -0600
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	Fabio Estevam <festevam@...il.com>
Cc:	matwey@....msu.ru, Mohit Kumar <mohit.kumar@...com>,
	Jingoo Han <jg1.han@...sung.com>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	matwey.kornilov@...il.com
Subject: Re: [PATCH] Export functions from pcie-designware

On Sat, Aug 30, 2014 at 10:07:30AM -0300, Fabio Estevam wrote:
> On Sat, Aug 30, 2014 at 9:24 AM,  <matwey@....msu.ru> wrote:
> > From: "Matwey V. Kornilov" <matwey@....msu.ru>
> >
> > pcie-spear13xx when built as module requires the functions from pcie-designware.
> > Export them properly.

I don't know how valuable pcie-spear13xx as a module is.  No other host
drivers are supported as a module.  Maybe we should just change
pcie-spear13xx from tristate to bool?

> >
> > Signed-off-by: Matwey V. Kornilov <matwey@....msu.ru>
> > ---
> >  drivers/pci/host/pcie-designware.c |  7 +++++++
> >  drivers/pci/host/pcie-designware.h | 14 +++++++-------
> >  2 files changed, 14 insertions(+), 7 deletions(-)
> >
> > diff --git a/drivers/pci/host/pcie-designware.c b/drivers/pci/host/pcie-designware.c
> > index 52bd3a1..7914b92c 100644
> > --- a/drivers/pci/host/pcie-designware.c
> > +++ b/drivers/pci/host/pcie-designware.c
> > @@ -89,6 +89,7 @@ int dw_pcie_cfg_read(void __iomem *addr, int where, int size, u32 *val)
> >
> >         return PCIBIOS_SUCCESSFUL;
> >  }
> > +EXPORT_SYMBOL(dw_pcie_cfg_read);
> 
> What about using EXPORT_SYMBOL_GPL instead?
> 
> > -int dw_pcie_cfg_read(void __iomem *addr, int where, int size, u32 *val);
> > -int dw_pcie_cfg_write(void __iomem *addr, int where, int size, u32 val);
> > -irqreturn_t dw_handle_msi_irq(struct pcie_port *pp);
> > -void dw_pcie_msi_init(struct pcie_port *pp);
> > -int dw_pcie_link_up(struct pcie_port *pp);
> > -void dw_pcie_setup_rc(struct pcie_port *pp);
> > -int dw_pcie_host_init(struct pcie_port *pp);
> > +extern int dw_pcie_cfg_read(void __iomem *addr, int where, int size, u32 *val);
> > +extern int dw_pcie_cfg_write(void __iomem *addr, int where, int size, u32 val);
> > +extern irqreturn_t dw_handle_msi_irq(struct pcie_port *pp);
> > +extern void dw_pcie_msi_init(struct pcie_port *pp);
> > +extern int dw_pcie_link_up(struct pcie_port *pp);
> > +extern void dw_pcie_setup_rc(struct pcie_port *pp);
> > +extern int dw_pcie_host_init(struct pcie_port *pp);
> 
> Why is this needed?

- This is logically separate from the EXPORT_SYMBOL change, so it should be
  a separate patch.

- I wouldn't take a patch adding "extern" to function declarations in a
  header file because I recently removed them all, e.g.,
  http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=f39d5b72913e.
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