linux-kernel - Re: [bootup crash, -git] Re: patch pci-pcie-aspm-support.patchadded to gregkh-2.6 tree

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Date:	Tue, 19 Feb 2008 21:42:24 -0800
From:	Greg KH <gregkh@...e.de>
To:	Shaohua Li <shaohua.li@...el.com>
Cc:	Greg KH <greg@...ah.com>, Ingo Molnar <mingo@...e.hu>,
	"Kok, Auke-jan H" <auke-jan.h.kok@...el.com>,
	linux-kernel@...r.kernel.org, linux-pci@...ey.karlin.mff.cuni.cz,
	matthew@....cx,
	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [bootup crash, -git] Re: patch
	pci-pcie-aspm-support.patchadded to gregkh-2.6 tree

On Wed, Feb 20, 2008 at 01:24:48PM +0800, Shaohua Li wrote:
> 
> On Tue, 2008-02-19 at 21:04 -0800, Greg KH wrote:
> > On Wed, Feb 20, 2008 at 12:48:21PM +0800, Shaohua Li wrote:
> > > 
> > > On Tue, 2008-02-19 at 20:14 -0800, Greg KH wrote:
> > > > On Wed, Feb 20, 2008 at 09:36:07AM +0800, Shaohua Li wrote:
> > > > > --- linux.orig/include/linux/pci-acpi.h	2008-02-19 11:03:51.000000000 +0800
> > > > > +++ linux/include/linux/pci-acpi.h	2008-02-20 09:19:15.000000000 +0800
> > > > > @@ -47,6 +47,7 @@
> > > > >  				OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL)
> > > > >  
> > > > >  #ifdef CONFIG_ACPI
> > > > > +#include <acpi/acpi_bus.h>
> > > > >  extern acpi_status pci_osc_control_set(acpi_handle handle, u32 flags);
> > > > >  extern acpi_status __pci_osc_support_set(u32 flags, const char *hid);
> > > > >  static inline acpi_status pci_osc_support_set(u32 flags)
> > > > > @@ -59,13 +60,11 @@ static inline acpi_status pcie_osc_suppo
> > > > >  }
> > > > >  #else
> > > > >  #if !defined(AE_ERROR)
> > > > > -typedef u32 		acpi_status;
> > > > > -#define AE_ERROR      	(acpi_status) (0x0001)
> > > > > -#endif    
> > > > > -static inline acpi_status pci_osc_control_set(acpi_handle handle, u32 flags)
> > > > > -{return AE_ERROR;}
> > > > > -static inline acpi_status pci_osc_support_set(u32 flags) {return AE_ERROR;} 
> > > > > -static inline acpi_status pcie_osc_support_set(u32 flags) {return AE_ERROR;}
> > > > > +#define AE_ERROR      	(0x0001)
> > > > > +#endif
> > > > > +#define pci_osc_control_set(handle, flags) (AE_ERROR)
> > > > > +#define pci_osc_support_set(flags) (AE_ERROR)
> > > > > +#define pcie_osc_support_set(flags) (AE_ERROR)
> > > > 
> > > > No, please use inline functions, don't change these functions that
> > > > should be just fine.  Why are you needing to change them?
> > > some types aren't defined in non-ACPI, like acpi_handle, acpi_status.
> > 
> > Then why include a non-ACPI header file in non-ACPI .c files?
> aspm is generic, but in ACPI platform, it needs special handling. I can
> add 'ifdef CONFIG_ACPI' in aspm.c to avoid changing pci-acpi.h, but
> thought it's better pci-acpi.h is self-contained.

Ugh, "generic" stuff needing ACPI, that's an oxymoron...

Will this ever work on non-ACPI systems?  If so, then I expect to see
some #ifdefs in the .c file (or split it into two) to handle that.  If
not, why not only include it if ACPI is enabled, as that means it really
is a dependancy :(

thanks,

greg k-h
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