linux-kernel - Re: [PATCH] base: isa: Remove X86

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Date:	Thu, 21 Jan 2016 15:47:04 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	William Breathitt Gray <vilhelm.gray@...il.com>,
	tglx@...utronix.de, mingo@...hat.com
Cc:	gregkh@...uxfoundation.org, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] base: isa: Remove X86_32 dependency

On 01/21/16 15:43, William Breathitt Gray wrote:
> On 01/21/2016 02:40 PM, H. Peter Anvin wrote:
>> CONFIG_ISA is mainly used to exclude drivers that are for ISA-specific
>> devices.
>>
>> However, PC/104 is indeed an actual ISA parallel bus, and as you say
>> widely used in embedded systems.  However, I would like to see if there
>> are anything hidden with !CONFIG_ISA which makes sense in PC104 systems.
> 
> My ultimate objective is to be able to use the ISA bus driver
> (drivers/base/isa.c). This driver is conditionally compiled based on
> CONFIG_ISA, which in turn depends on CONFIG_X86_32. Up until now, I've
> been using platform_driver for my non-hotpluggable PC/104 devices, but
> it appears that isa_driver is more appropriate; unfortunately, I have
> CONFIG_X86_64 set, which prevents the compilation of drivers/base/isa.c
> due to the CONFIG_X86_32 dependency.
> 
> I can alternatively create a patch to introduce a CONFIG_PC104 option.
> This would allow the compilation of the ISA bus driver on either
> CONFIG_ISA or CONFIG_PC104, thus allowing CONFIG_ISA to remain dependent
> on CONFIG_X86_32. However, if the CONFIG_X86_32 dependency was
> arbitrarily added to simply hide ISA functionality from newer
> motherboards, perhaps the dependency should be removed.
> 

Well, and as you can see from the build robot because a lot of those
drivers simply don't compile on 64-bit systems.  If nothing else you
would have to push the 32-bit tests downward in the config dependency tree.

	-hpa