Undefined '.bus_to_virt', '.virt_to_bus' causes compile error on Powerpc 64-bit

Undefined '.bus_to_virt', '.virt_to_bus' causes compile error on Powerpc 64-bit

[Judith Lebzelter]

Hello:

For the automated cross-compile builds at OSDL, powerpc 64-bit 
'allmodconfig' is failing.  The warnings/errors below appear in 
the 'modpost' stage of kernel compiles for 2.6.18 and -mm2 kernels.

Thanks;
Judith Lebzelter
OSDL

-----------

  Building modules, stage 2.
  MODPOST 1658 modules
WARNING: Can't handle masks in drivers/ata/ahci:FFFF05
WARNING: ".virt_to_bus" [sound/oss/sscape.ko] undefined!
WARNING: ".virt_to_bus" [sound/oss/sound.ko] undefined!
WARNING: ".bus_to_virt" [sound/oss/cs46xx.ko] undefined!
WARNING: ".virt_to_bus" [sound/oss/cs46xx.ko] undefined!
WARNING: ".bus_to_virt" [drivers/scsi/tmscsim.ko] undefined!
WARNING: ".bus_to_virt" [drivers/scsi/BusLogic.ko] undefined!
WARNING: ".virt_to_bus" [drivers/net/wan/lmc/lmc.ko] undefined!
WARNING: ".virt_to_bus" [drivers/message/i2o/i2o_config.ko] undefined!
WARNING: ".bus_to_virt" [drivers/block/cpqarray.ko] undefined!
WARNING: ".bus_to_virt" [drivers/atm/zatm.ko] undefined!
WARNING: ".virt_to_bus" [drivers/atm/zatm.ko] undefined!
WARNING: ".bus_to_virt" [drivers/atm/horizon.ko] undefined!
WARNING: ".virt_to_bus" [drivers/atm/firestream.ko] undefined!
WARNING: ".bus_to_virt" [drivers/atm/firestream.ko] undefined!
WARNING: ".bus_to_virt" [drivers/atm/ambassador.ko] undefined!
WARNING: ".virt_to_bus" [drivers/atm/ambassador.ko] undefined!
make[1]: *** [__modpost] Error 1
make: *** [modules] Error 2

Re: Undefined '.bus_to_virt', '.virt_to_bus' causes compile error on Powerpc 64-bit

[Adrian Bunk]

On Mon, Oct 02, 2006 at 02:49:54PM -0700, Judith Lebzelter wrote:

> Hello:

Hi Judith,

> For the automated cross-compile builds at OSDL, powerpc 64-bit 
> 'allmodconfig' is failing.  The warnings/errors below appear in 
> the 'modpost' stage of kernel compiles for 2.6.18 and -mm2 kernels.

known for ages - the drivers need fixing.

You might want to convince Andrew accepting my patch to make 
virt_to_bus/bus_to_virt give compile warnings on i386 for making
people more aware of this problem...

> Thanks;
> Judith Lebzelter
> OSDL
> 
> -----------
> 
>   Building modules, stage 2.
>   MODPOST 1658 modules
> WARNING: Can't handle masks in drivers/ata/ahci:FFFF05
> WARNING: ".virt_to_bus" [sound/oss/sscape.ko] undefined!
> WARNING: ".virt_to_bus" [sound/oss/sound.ko] undefined!
> WARNING: ".bus_to_virt" [sound/oss/cs46xx.ko] undefined!
> WARNING: ".virt_to_bus" [sound/oss/cs46xx.ko] undefined!
> WARNING: ".bus_to_virt" [drivers/scsi/tmscsim.ko] undefined!
> WARNING: ".bus_to_virt" [drivers/scsi/BusLogic.ko] undefined!
> WARNING: ".virt_to_bus" [drivers/net/wan/lmc/lmc.ko] undefined!
> WARNING: ".virt_to_bus" [drivers/message/i2o/i2o_config.ko] undefined!
> WARNING: ".bus_to_virt" [drivers/block/cpqarray.ko] undefined!
> WARNING: ".bus_to_virt" [drivers/atm/zatm.ko] undefined!
> WARNING: ".virt_to_bus" [drivers/atm/zatm.ko] undefined!
> WARNING: ".bus_to_virt" [drivers/atm/horizon.ko] undefined!
> WARNING: ".virt_to_bus" [drivers/atm/firestream.ko] undefined!
> WARNING: ".bus_to_virt" [drivers/atm/firestream.ko] undefined!
> WARNING: ".bus_to_virt" [drivers/atm/ambassador.ko] undefined!
> WARNING: ".virt_to_bus" [drivers/atm/ambassador.ko] undefined!
> make[1]: *** [__modpost] Error 1
> make: *** [modules] Error 2
> 

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

[2.6 patch] mark virt_to_bus/bus_to_virt as __deprecated on i386

[Adrian Bunk]

On Tue, Oct 03, 2006 at 01:44:28AM +0200, Adrian Bunk wrote:
> On Mon, Oct 02, 2006 at 02:49:54PM -0700, Judith Lebzelter wrote:
> 
> > Hello:
> 
> Hi Judith,
> 
> > For the automated cross-compile builds at OSDL, powerpc 64-bit 
> > 'allmodconfig' is failing.  The warnings/errors below appear in 
> > the 'modpost' stage of kernel compiles for 2.6.18 and -mm2 kernels.
> 
> known for ages - the drivers need fixing.
> 
> You might want to convince Andrew accepting my patch to make 
> virt_to_bus/bus_to_virt give compile warnings on i386 for making
> people more aware of this problem...
>...

In case anyone is interested, the patch is below.

cu
Adrian


<--  snip  -->


virt_to_bus/bus_to_virt are long deprecated, mark them as __deprecated 
on i386.

Without such warnings people will never update their code and fix 
the errors in PPC64 builds.

And yes, some of the drivers affected are maintained.

This also catches accidential additions of users for these functions 
like a usage of bus_to_virt() in the infiniband code that was added in 
2.6.17-rc1 (already removed).

This patch increases the number of warnings shown during builds, but it 
seems worth including it at least in -mm for making people aware of this 
issue.

Signed-off-by: Adrian Bunk <bunk@stusta.de>

---

This patch was already sent on:
- 7 Jul 2006
- 26 Jun 2006
- 27 Apr 2006
- 19 Apr 2006
- 6 Jan 2006
- 13 Dec 2005
- 23 Nov 2005
- 18 Nov 2005
- 12 Nov 2005

--- linux-2.6.14-mm2-full/include/asm-i386/io.h.old	2005-11-12 01:44:38.000000000 +0100
+++ linux-2.6.14-mm2-full/include/asm-i386/io.h	2005-11-12 01:45:58.000000000 +0100
@@ -144,8 +144,14 @@
  *
  * Allow them on x86 for legacy drivers, though.
  */
-#define virt_to_bus virt_to_phys
-#define bus_to_virt phys_to_virt
+static inline unsigned long __deprecated virt_to_bus(volatile void * address)
+{
+	return __pa(address);
+}
+static inline void * __deprecated bus_to_virt(unsigned long address)
+{
+	return __va(address);
+}
 
 /*
  * readX/writeX() are used to access memory mapped devices. On some

Re: [2.6 patch] mark virt_to_bus/bus_to_virt as __deprecated on i386

[Nicholas Miell]

On Tue, 2006-10-03 at 03:22 +0200, Adrian Bunk wrote:
> On Tue, Oct 03, 2006 at 01:44:28AM +0200, Adrian Bunk wrote:
> > On Mon, Oct 02, 2006 at 02:49:54PM -0700, Judith Lebzelter wrote:
> > 
> > > Hello:
> > 
> > Hi Judith,
> > 
> > > For the automated cross-compile builds at OSDL, powerpc 64-bit 
> > > 'allmodconfig' is failing.  The warnings/errors below appear in 
> > > the 'modpost' stage of kernel compiles for 2.6.18 and -mm2 kernels.
> > 
> > known for ages - the drivers need fixing.
> > 
> > You might want to convince Andrew accepting my patch to make 
> > virt_to_bus/bus_to_virt give compile warnings on i386 for making
> > people more aware of this problem...
> >...
> 
> In case anyone is interested, the patch is below.
> 
> cu
> Adrian
> 

Won't this also cause warnings for valid arch-specific usage (i.e. in
linux/arch/{i386,x86_64})?

-- 
Nicholas Miell <nmiell@comcast.net>

Re: [2.6 patch] mark virt_to_bus/bus_to_virt as __deprecated on i386

[Adrian Bunk]

On Mon, Oct 02, 2006 at 06:48:11PM -0700, Nicholas Miell wrote:
> On Tue, 2006-10-03 at 03:22 +0200, Adrian Bunk wrote:
> > On Tue, Oct 03, 2006 at 01:44:28AM +0200, Adrian Bunk wrote:
> > > On Mon, Oct 02, 2006 at 02:49:54PM -0700, Judith Lebzelter wrote:
> > > 
> > > > Hello:
> > > 
> > > Hi Judith,
> > > 
> > > > For the automated cross-compile builds at OSDL, powerpc 64-bit 
> > > > 'allmodconfig' is failing.  The warnings/errors below appear in 
> > > > the 'modpost' stage of kernel compiles for 2.6.18 and -mm2 kernels.
> > > 
> > > known for ages - the drivers need fixing.
> > > 
> > > You might want to convince Andrew accepting my patch to make 
> > > virt_to_bus/bus_to_virt give compile warnings on i386 for making
> > > people more aware of this problem...
> > >...
> > 
> > In case anyone is interested, the patch is below.
> > 
> > cu
> > Adrian
> > 
> 
> Won't this also cause warnings for valid arch-specific usage (i.e. in
> linux/arch/{i386,x86_64})?

They aren't used under linux/arch/i386/ and my patch doesn't change x86_64.

> Nicholas Miell <nmiell@comcast.net>

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

Re: [2.6 patch] mark virt_to_bus/bus_to_virt as __deprecated on i386

[Nicholas Miell]

On Tue, 2006-10-03 at 03:58 +0200, Adrian Bunk wrote:
> On Mon, Oct 02, 2006 at 06:48:11PM -0700, Nicholas Miell wrote:
> > On Tue, 2006-10-03 at 03:22 +0200, Adrian Bunk wrote:
> > > On Tue, Oct 03, 2006 at 01:44:28AM +0200, Adrian Bunk wrote:
> > > > On Mon, Oct 02, 2006 at 02:49:54PM -0700, Judith Lebzelter wrote:
> > > > 
> > > > > Hello:
> > > > 
> > > > Hi Judith,
> > > > 
> > > > > For the automated cross-compile builds at OSDL, powerpc 64-bit 
> > > > > 'allmodconfig' is failing.  The warnings/errors below appear in 
> > > > > the 'modpost' stage of kernel compiles for 2.6.18 and -mm2 kernels.
> > > > 
> > > > known for ages - the drivers need fixing.
> > > > 
> > > > You might want to convince Andrew accepting my patch to make 
> > > > virt_to_bus/bus_to_virt give compile warnings on i386 for making
> > > > people more aware of this problem...
> > > >...
> > > 
> > > In case anyone is interested, the patch is below.
> > > 
> > > cu
> > > Adrian
> > > 
> > 
> > Won't this also cause warnings for valid arch-specific usage (i.e. in
> > linux/arch/{i386,x86_64})?
> 
> They aren't used under linux/arch/i386/ and my patch doesn't change x86_64.

Sorry, for some reason I thought isa_bus_to_virt and isa_virt_to_bus
were defined in terms of virt_to_bus/bus_to_virt instead of
virt_to_phys/phys_to_virt.


-- 
Nicholas Miell <nmiell@comcast.net>

Re: [2.6 patch] mark virt_to_bus/bus_to_virt as __deprecated on i386

[Benjamin Herrenschmidt]

> Won't this also cause warnings for valid arch-specific usage (i.e. in
> linux/arch/{i386,x86_64})?

I wouldn't cause that usage valid :)

Ben.

Re: [2.6 patch] mark virt_to_bus/bus_to_virt as __deprecated on i386

[Alan Cox]

Ar Maw, 2006-10-03 am 14:37 +1000, ysgrifennodd Benjamin Herrenschmidt:
> > Won't this also cause warnings for valid arch-specific usage (i.e. in
> > linux/arch/{i386,x86_64})?
> 
> I wouldn't cause that usage valid :)

Actually a lot of the older legitimate users (DRM/AGP) have been cleaned
up so it might be worth doing now after all.

Ok I take back the NAK having looked deeper. We appear to have made
sufficient progress along the way.

Acked-by: Alan Cox <alan@redhat.com>

Re: [2.6 patch] mark virt_to_bus/bus_to_virt as __deprecated on i386

[Benjamin Herrenschmidt]

> > You might want to convince Andrew accepting my patch to make 
> > virt_to_bus/bus_to_virt give compile warnings on i386 for making
> > people more aware of this problem...
> >...

Andrew, is there any reason not to take that patch ?

> <--  snip  -->
> 
> 
> virt_to_bus/bus_to_virt are long deprecated, mark them as __deprecated 
> on i386.
> 
> Without such warnings people will never update their code and fix 
> the errors in PPC64 builds.
> 
> And yes, some of the drivers affected are maintained.
> 
> This also catches accidential additions of users for these functions 
> like a usage of bus_to_virt() in the infiniband code that was added in 
> 2.6.17-rc1 (already removed).
> 
> This patch increases the number of warnings shown during builds, but it 
> seems worth including it at least in -mm for making people aware of this 
> issue.
> 
> Signed-off-by: Adrian Bunk <bunk@stusta.de>
> 
> ---
> 
> This patch was already sent on:
> - 7 Jul 2006
> - 26 Jun 2006
> - 27 Apr 2006
> - 19 Apr 2006
> - 6 Jan 2006
> - 13 Dec 2005
> - 23 Nov 2005
> - 18 Nov 2005
> - 12 Nov 2005
> 
> --- linux-2.6.14-mm2-full/include/asm-i386/io.h.old	2005-11-12 01:44:38.000000000 +0100
> +++ linux-2.6.14-mm2-full/include/asm-i386/io.h	2005-11-12 01:45:58.000000000 +0100
> @@ -144,8 +144,14 @@
>   *
>   * Allow them on x86 for legacy drivers, though.
>   */
> -#define virt_to_bus virt_to_phys
> -#define bus_to_virt phys_to_virt
> +static inline unsigned long __deprecated virt_to_bus(volatile void * address)
> +{
> +	return __pa(address);
> +}
> +static inline void * __deprecated bus_to_virt(unsigned long address)
> +{
> +	return __va(address);
> +}
>  
>  /*
>   * readX/writeX() are used to access memory mapped devices. On some
> 
> _______________________________________________
> Linuxppc-dev mailing list
> Linuxppc-dev@ozlabs.org
> https://ozlabs.org/mailman/listinfo/linuxppc-dev

Re: [2.6 patch] mark virt_to_bus/bus_to_virt as __deprecated on i386

[Andrew Morton]

On Tue, 03 Oct 2006 14:37:25 +1000
Benjamin Herrenschmidt <benh@kernel.crashing.org> wrote:

> > > You might want to convince Andrew accepting my patch to make 
> > > virt_to_bus/bus_to_virt give compile warnings on i386 for making
> > > people more aware of this problem...
> > >...
> 
> Andrew, is there any reason not to take that patch ?

It generates lots of warnings from drivers which nobody does any work on.

Net result: lots of new warnings, no fixed bugs.

Re: [2.6 patch] mark virt_to_bus/bus_to_virt as __deprecated on i386

[Benjamin Herrenschmidt]

On Mon, 2006-10-02 at 21:44 -0700, Andrew Morton wrote:
> On Tue, 03 Oct 2006 14:37:25 +1000
> Benjamin Herrenschmidt <benh@kernel.crashing.org> wrote:
> 
> > > > You might want to convince Andrew accepting my patch to make 
> > > > virt_to_bus/bus_to_virt give compile warnings on i386 for making
> > > > people more aware of this problem...
> > > >...
> > 
> > Andrew, is there any reason not to take that patch ?
> 
> It generates lots of warnings from drivers which nobody does any work on.
> 
> Net result: lots of new warnings, no fixed bugs.

Are you sure the warnings won't cause somebody like Al to go through
them all and fix them ?

At least they should be marked either CONFIG_BROKEN or X86 only (or
whatever arch they are supposed to be used on).

Ben.

Re: [2.6 patch] mark virt_to_bus/bus_to_virt as __deprecated on i386

[Andrew Morton]

On Tue, 03 Oct 2006 14:49:39 +1000
Benjamin Herrenschmidt <benh@kernel.crashing.org> wrote:

> On Mon, 2006-10-02 at 21:44 -0700, Andrew Morton wrote:
> > On Tue, 03 Oct 2006 14:37:25 +1000
> > Benjamin Herrenschmidt <benh@kernel.crashing.org> wrote:
> > 
> > > > > You might want to convince Andrew accepting my patch to make 
> > > > > virt_to_bus/bus_to_virt give compile warnings on i386 for making
> > > > > people more aware of this problem...
> > > > >...
> > > 
> > > Andrew, is there any reason not to take that patch ?
> > 
> > It generates lots of warnings from drivers which nobody does any work on.
> > 
> > Net result: lots of new warnings, no fixed bugs.
> 
> Are you sure the warnings won't cause somebody like Al to go through
> them all and fix them ?

The drivers simply don't link on some architectures, due to missing
virt_to_bus/bus_to_virt.    They aren't hard to find.

> At least they should be marked either CONFIG_BROKEN or X86 only (or
> whatever arch they are supposed to be used on).
> 

Something like that would make sense.  I guess a new config option.

Re: [2.6 patch] mark virt_to_bus/bus_to_virt as __deprecated on i386

[Adrian Bunk]

On Mon, Oct 02, 2006 at 09:55:27PM -0700, Andrew Morton wrote:
> On Tue, 03 Oct 2006 14:49:39 +1000
> Benjamin Herrenschmidt <benh@kernel.crashing.org> wrote:
> 
> > On Mon, 2006-10-02 at 21:44 -0700, Andrew Morton wrote:
> > > On Tue, 03 Oct 2006 14:37:25 +1000
> > > Benjamin Herrenschmidt <benh@kernel.crashing.org> wrote:
> > > 
> > > > > > You might want to convince Andrew accepting my patch to make 
> > > > > > virt_to_bus/bus_to_virt give compile warnings on i386 for making
> > > > > > people more aware of this problem...
> > > > > >...
> > > > 
> > > > Andrew, is there any reason not to take that patch ?
> > > 
> > > It generates lots of warnings from drivers which nobody does any work on.
> > > 
> > > Net result: lots of new warnings, no fixed bugs.
> > 
> > Are you sure the warnings won't cause somebody like Al to go through
> > them all and fix them ?
> 
> The drivers simply don't link on some architectures, due to missing
> virt_to_bus/bus_to_virt.    They aren't hard to find.
>...

As my patch description says, there had even been one bus_to_virt() 
accidentally added in 2.6.17-rc1.

Shouldn't people become aware of it as early and as often as possible?

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

Re: [2.6 patch] mark virt_to_bus/bus_to_virt as __deprecated on i386

[Stefan Richter]

Benjamin Herrenschmidt wrote:
> On Mon, 2006-10-02 at 21:44 -0700, Andrew Morton wrote:
>> Net result: lots of new warnings, no fixed bugs.
> 
> Are you sure the warnings won't cause somebody like Al to go through
> them all and fix them ?

If you mean by "fix" to actually convert to generic DMA mapping, then
this task may turn out to require in-depth knowledge of the driver and
its field of application in some or many of these cases.
-- 
Stefan Richter
-=====-=-==- =-=- ---==
http://arcgraph.de/sr/

Re: [2.6 patch] mark virt_to_bus/bus_to_virt as __deprecated on i386

[Alan Cox]

Ar Maw, 2006-10-03 am 03:22 +0200, ysgrifennodd Adrian Bunk:
> This patch was already sent on:
> - 7 Jul 2006
> - 26 Jun 2006
> - 27 Apr 2006
> - 19 Apr 2006
> - 6 Jan 2006
> - 13 Dec 2005
> - 23 Nov 2005
> - 18 Nov 2005
> - 12 Nov 2005

This patch was already NAKed on
...

These functions are used internally in the x86 core code correctly and
validly. It's just as easy to find the offenders with grep or building a
PPC tree.

Re: Undefined '.bus_to_virt', '.virt_to_bus' causes compile error on Powerpc 64-bit

[Guennadi Liakhovetski]

On Tue, 3 Oct 2006, Adrian Bunk wrote:

> On Mon, Oct 02, 2006 at 02:49:54PM -0700, Judith Lebzelter wrote:
> 
> > For the automated cross-compile builds at OSDL, powerpc 64-bit 
> > 'allmodconfig' is failing.  The warnings/errors below appear in 
> > the 'modpost' stage of kernel compiles for 2.6.18 and -mm2 kernels.
> 
> known for ages - the drivers need fixing.

...

> > WARNING: ".bus_to_virt" [drivers/scsi/tmscsim.ko] undefined!

The problem with this one is that the code path, where bus_to_virt is 
used, is only executed under some very exotic circumstances, i.e., 
is practically untestable. I'll try to cook something up for that...

Thanks
Guennadi
---
Guennadi Liakhovetski

Re: Undefined '.bus_to_virt', '.virt_to_bus' causes compile error on Powerpc 64-bit

[Benjamin Herrenschmidt]

On Mon, 2006-10-02 at 14:49 -0700, Judith Lebzelter wrote:
> Hello:
> 
> For the automated cross-compile builds at OSDL, powerpc 64-bit 
> 'allmodconfig' is failing.  The warnings/errors below appear in 
> the 'modpost' stage of kernel compiles for 2.6.18 and -mm2 kernels.

All those drivers are bogus and need to be updated. They should be
marked CONFIG_BROKEN

Ben.

> Thanks;
> Judith Lebzelter
> OSDL
> 
> -----------
> 
>   Building modules, stage 2.
>   MODPOST 1658 modules
> WARNING: Can't handle masks in drivers/ata/ahci:FFFF05
> WARNING: ".virt_to_bus" [sound/oss/sscape.ko] undefined!
> WARNING: ".virt_to_bus" [sound/oss/sound.ko] undefined!
> WARNING: ".bus_to_virt" [sound/oss/cs46xx.ko] undefined!
> WARNING: ".virt_to_bus" [sound/oss/cs46xx.ko] undefined!
> WARNING: ".bus_to_virt" [drivers/scsi/tmscsim.ko] undefined!
> WARNING: ".bus_to_virt" [drivers/scsi/BusLogic.ko] undefined!
> WARNING: ".virt_to_bus" [drivers/net/wan/lmc/lmc.ko] undefined!
> WARNING: ".virt_to_bus" [drivers/message/i2o/i2o_config.ko] undefined!
> WARNING: ".bus_to_virt" [drivers/block/cpqarray.ko] undefined!
> WARNING: ".bus_to_virt" [drivers/atm/zatm.ko] undefined!
> WARNING: ".virt_to_bus" [drivers/atm/zatm.ko] undefined!
> WARNING: ".bus_to_virt" [drivers/atm/horizon.ko] undefined!
> WARNING: ".virt_to_bus" [drivers/atm/firestream.ko] undefined!
> WARNING: ".bus_to_virt" [drivers/atm/firestream.ko] undefined!
> WARNING: ".bus_to_virt" [drivers/atm/ambassador.ko] undefined!
> WARNING: ".virt_to_bus" [drivers/atm/ambassador.ko] undefined!
> make[1]: *** [__modpost] Error 1
> make: *** [modules] Error 2
> 
> _______________________________________________
> Linuxppc-dev mailing list
> Linuxppc-dev@ozlabs.org
> https://ozlabs.org/mailman/listinfo/linuxppc-dev

Re: Undefined '.bus_to_virt', '.virt_to_bus' causes compile error on Powerpc 64-bit

[Alan Cox]

Ar Maw, 2006-10-03 am 11:05 +1000, ysgrifennodd Benjamin Herrenschmidt:
> On Mon, 2006-10-02 at 14:49 -0700, Judith Lebzelter wrote:
> > Hello:
> > 
> > For the automated cross-compile builds at OSDL, powerpc 64-bit 
> > 'allmodconfig' is failing.  The warnings/errors below appear in 
> > the 'modpost' stage of kernel compiles for 2.6.18 and -mm2 kernels.
> 
> All those drivers are bogus and need to be updated. They should be
> marked CONFIG_BROKEN

Several of them are only really meaningful on PC so marking them BROKEN
is the wrong answer. Some of them definitely do need updating but stuff
like the remaining OSS drivers are just waiting to die out quietly.

Re: Undefined '.bus_to_virt', '.virt_to_bus' causes compile error on Powerpc 64-bit

[Paul Mackerras]

Judith,

> For the automated cross-compile builds at OSDL, powerpc 64-bit 
> 'allmodconfig' is failing.  The warnings/errors below appear in 
> the 'modpost' stage of kernel compiles for 2.6.18 and -mm2 kernels.

virt_to_bus and bus_to_virt are old interfaces that have been
deprecated for, oh, at least 5 years now, and can't be implemented
sanely on machines with an IOMMU - which includes all 64-bit powerpc
machines.

Unless someone pops up and volunteers to fix those old drivers, which
is unlikely, the only solution is to fix the Kconfig files to prevent
them from being selected on platforms that don't have virt_to_bus and
bus_to_virt.

Paul.