linux-kernel - Re: [PATCH v6 1/2] serial_core: add pci uart early console support

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Date:	Mon, 27 Jul 2015 16:33:12 -0700
From:	Bin Gao <bin.gao@...ux.intel.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
	Peter Hurley <peter@...leysoftware.com>,
	Jiri Slaby <jslaby@...e.cz>, Paul Bolle <pebolle@...cali.nl>,
	linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 1/2] serial_core: add pci uart early console support

On Thu, Jul 23, 2015 at 03:21:27PM -0700, Greg Kroah-Hartman wrote:
> > +config PCI_EARLY
> > +	bool "Early PCI access"
> > +	depends on PCI
> > +	default n
> 
> Default is always 'n' so this isn't needed here.

Will fix this.

> > diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
> > index 0b7bb12..5b21999 100644
> > --- a/drivers/tty/serial/serial_core.c
> > +++ b/drivers/tty/serial/serial_core.c
> > @@ -34,10 +34,15 @@
> >  #include <linux/serial_core.h>
> >  #include <linux/delay.h>
> >  #include <linux/mutex.h>
> > +#include <linux/pci_regs.h>
> >  
> >  #include <asm/irq.h>
> >  #include <asm/uaccess.h>
> >  
> > +#ifdef CONFIG_PCI_EARLY
> > +#include <asm/pci-direct.h>
> > +#endif
> 
> You shouldn't need an #ifdef here, the .h file should handle it.  Why
> doesn't pci.h always include this if it is present?

Only x86 has asm/pci-direct.h. Compiling on any other archs will fail
if we don't put CONFIG_PCI_EARLY here. That's way I added a new config
option CONFIG_PCI_EARLY to drivers/pci/Kconfig and let an arch to select
it. Do you want me to move "#include <asm/pci-direct.h>" to linux/pci.h?

> 
> thanks,
> 
> greg k-h
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