ACPI_BUS dependency for CONFIG_PNP

ACPI_BUS dependency for CONFIG_PNP

[Andi Kleen]

2.6.10rc2 got this new dependency: 

config PNP
        bool "Plug and Play support"
        depends on ISA || ACPI_BUS

from the ACPI update. This enables ISA-PNP on x86-64, where
it was always disabled previously and is completely useless. Can someone
explain the rationale behind that change? IMHO you should never use 
ISA-PNP without CONFIG_ISA.

I would prefer if that hunk was reverted.

Thanks,
-Andi


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Re: ACPI_BUS dependency for CONFIG_PNP

[Len Brown]

On Mon, 2004-11-15 at 06:46, Andi Kleen wrote:
> 2.6.10rc2 got this new dependency:
> 
> config PNP
>         bool "Plug and Play support"
>         depends on ISA || ACPI_BUS
> 
> from the ACPI update. This enables ISA-PNP on x86-64, where
> it was always disabled previously and is completely useless. Can
> someone
> explain the rationale behind that change? IMHO you should never use
> ISA-PNP without CONFIG_ISA.

Linux PNP handles up to 3 protocols:
ISAPNP -- useful only if CONFIG_ISA, independent of PNPBIOS and PNPACPI
PNPBIOS -- useful only if acpi_disabled
PNPACPI -- useful if !acpi_disabled

drivers/pnp/isapnp/Kconfig appears to already have the dependency you're
looking for to make sure that ISAPNP is not defined without CONFIG_ISA:

config ISAPNP
        bool "ISA Plug and Play support"
        depends on PNP && ISA






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Re: ACPI_BUS dependency for CONFIG_PNP

[Andi Kleen]

On Mon, Nov 15, 2004 at 11:42:47AM -0500, Brown, Len wrote:
> On Mon, 2004-11-15 at 06:46, Andi Kleen wrote:
> > 2.6.10rc2 got this new dependency:
> > 
> > config PNP
> >         bool "Plug and Play support"
> >         depends on ISA || ACPI_BUS
> > 
> > from the ACPI update. This enables ISA-PNP on x86-64, where
> > it was always disabled previously and is completely useless. Can
> > someone
> > explain the rationale behind that change? IMHO you should never use
> > ISA-PNP without CONFIG_ISA.
> 
> Linux PNP handles up to 3 protocols:
> ISAPNP -- useful only if CONFIG_ISA, independent of PNPBIOS and PNPACPI
> PNPBIOS -- useful only if acpi_disabled
> PNPACPI -- useful if !acpi_disabled

Useful for what? As far as I know no device on x86-64 needs PNPBIOS
or PNPACPI

> 
> drivers/pnp/isapnp/Kconfig appears to already have the dependency you're
> looking for to make sure that ISAPNP is not defined without CONFIG_ISA:
> 
> config ISAPNP
>         bool "ISA Plug and Play support"
>         depends on PNP && ISA
> 

Perhaps. But it doesn't work. 

-Andi


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Re: ACPI_BUS dependency for CONFIG_PNP

[Adam Belay]

On Mon, Nov 15, 2004 at 06:35:25PM +0100, Andi Kleen wrote:
> On Mon, Nov 15, 2004 at 11:42:47AM -0500, Brown, Len wrote:
> > On Mon, 2004-11-15 at 06:46, Andi Kleen wrote:
> > > 2.6.10rc2 got this new dependency:
> > > 
> > > config PNP
> > >         bool "Plug and Play support"
> > >         depends on ISA || ACPI_BUS
> > > 
> > > from the ACPI update. This enables ISA-PNP on x86-64, where
> > > it was always disabled previously and is completely useless. Can
> > > someone
> > > explain the rationale behind that change? IMHO you should never use
> > > ISA-PNP without CONFIG_ISA.
> > 
> > Linux PNP handles up to 3 protocols:
> > ISAPNP -- useful only if CONFIG_ISA, independent of PNPBIOS and PNPACPI
> > PNPBIOS -- useful only if acpi_disabled
> > PNPACPI -- useful if !acpi_disabled
> 
> Useful for what? As far as I know no device on x86-64 needs PNPBIOS
> or PNPACPI

Most x86-64 hardware still utilizes ACPI for certain devices.

> 
> > 
> > drivers/pnp/isapnp/Kconfig appears to already have the dependency you're
> > looking for to make sure that ISAPNP is not defined without CONFIG_ISA:
> > 
> > config ISAPNP
> >         bool "ISA Plug and Play support"
> >         depends on PNP && ISA
> > 
> 
> Perhaps. But it doesn't work. 

In which way doesn't it work?  It seems to pretty clearly require ISA support.
Is there a bug?

Thanks,
Adam


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