linux-kernel - Re: [PATCH 0/4] Decouple X86_32 dependency from the ISA Kconfig option

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Date:	Wed, 13 Apr 2016 09:26:02 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	William Breathitt Gray <vilhelm.gray@...il.com>
Cc:	tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
	gregkh@...uxfoundation.org, x86@...nel.org,
	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
	alsa-devel@...a-project.org
Subject: Re: [PATCH 0/4] Decouple X86_32 dependency from the ISA Kconfig
 option


* William Breathitt Gray <vilhelm.gray@...il.com> wrote:

> This patchset is based on top of commit 3a3a5fece6f2 ("fs: kernfs: Replace
> CURRENT_TIME by current_fs_time()") of the driver-core-testing branch of
> the driver-core repository.
> 
> The introduction of the ISA_BUS option in commit b3c1be1b789c
> ("base: isa: Remove X86_32 dependency") blocks the compilation of ISA
> drivers on non-x86 platforms. The ISA_BUS configuration option should not
> be necessary if the X86_32 dependency can be decoupled from the ISA
> configuration option. This patchset both removes the ISA_BUS configuration
> option entirely and decouples the X86_32 dependency from the ISA
> configuration option.
> 
> The PNPBIOS driver requires preprocessor defines (located in
> include/asm/segment.h) only declared if the architecture is set to X86_32.
> If the architecture is set to X86_64, the PNPBIOS driver will not build
> properly. The X86 dependecy for the PNPBIOS configuration option is changed
> to an explicit X86_32 dependency in order to prevent an attempt to build
> for an unsupported architecture.
> 
> Changes to the ISA SSCAPE and SCSI ULTRASTOR drivers are also included. The
> relevant patches simply fix format string identifier mismatches exposed
> during an attempted X86_64 compilation after the decoupling of the X86_32
> dependency from the ISA configuration option. These patches fix compilation
> warnings rather than errors, but the solutions were so trivial that I
> decided to include them in this patchset. If it would be inappropriate to
> include them in this patchset, let me know and I will rebase to remove the
> relevant patches.
> 
> William Breathitt Gray (4):
>   pnp: pnpbios: Add explicit X86_32 dependency to PNPBIOS
>   sound: isa: sscape: Use correct format identifier for size_t
>   scsi: ultrastor: Use correct format identifier for kernel pointer
>   isa: Remove the ISA_BUS Kconfig option
> 
>  arch/x86/Kconfig            | 10 ++--------
>  drivers/base/Makefile       |  2 +-
>  drivers/pnp/pnpbios/Kconfig |  2 +-
>  drivers/scsi/ultrastor.c    |  8 ++++----
>  include/linux/isa.h         |  2 +-
>  sound/isa/sscape.c          |  2 +-
>  6 files changed, 10 insertions(+), 16 deletions(-)

What's the practical motivation of this? What exact hardware is this for?

Thanks,

	Ingo