linux-kernel - Re: [PATCH] ARM: OMAP4: remove dead kconfig option OMAP4_ERRATA

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Date:	Tue, 17 Mar 2015 11:57:00 -0500
From:	Nishanth Menon <nm@...com>
To:	Tony Lindgren <tony@...mide.com>
Cc:	Russell King - ARM Linux <linux@....linux.org.uk>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	santosh shilimkar <santosh.shilimkar@...cle.com>,
	lkml <linux-kernel@...r.kernel.org>,
	Stefan Hengelein <stefan.hengelein@....de>,
	linux-omap <linux-omap@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] ARM: OMAP4: remove dead kconfig option OMAP4_ERRATA_I688

On Tue, Mar 17, 2015 at 11:34 AM, Tony Lindgren <tony@...mide.com> wrote:
>> On 03/17/2015 11:26 AM, santosh shilimkar wrote:
>> >
>> >
>> > On 3/16/2015 4:30 PM, Tony Lindgren wrote:
>> >> * Stefan Hengelein <stefan.hengelein@....de> [150225 10:48]:
>> >>> The Kconfig-Option OMAP4_ERRATA_I688 is never visible due to a
>> >>> contradiction in it's dependencies.
>> >>> The option requires ARCH_MULTIPLATFORM to be 'disabled'. However, an
>> >>> enclosing menu requires either ARCH_MULTI_V6 or ARCH_MULTI_V7 to be
>> >>> enabled. These options inherit a dependency from an enclosing menu,
>> >>> that requires ARCH_MULTIPLATFORM to be 'enabled'.
>> >>> This is a contradiction and made this option also unavailable for
>> >>> non-multiplatform configurations.
>> >>>
>> >>> Since there are no selects on OMAP4_ERRATA_I688, which would ignore
>> >>> dependencies, the code related to that option is dead and can be
>> >>> removed.
>> >>>
>> >>> This (logical) defect has been found with the undertaker tool.
>> >>> (https://undertaker.cs.fau.de)
>> >>>
>> >>> Signed-off-by: Stefan Hengelein <stefan.hengelein@....de>
>> >>>
>> >>> ---
>> >>> Tony Lindgren suggested to remove the code since nobody complained for
>> >>> a few years and Santosh Shilimkar agreed.
>> >>> https://lkml.org/lkml/2015/2/25/449
>> >>> ---
>> >>> As far as I see, this should remove all the code related to
>> >>> OMAP4_ERRATA_I688, I hope I didn't remove too much.
>> >>
>> >> Seems to boot fine, so applying into omap-for-v4.1/fixes-not-urgent.
>> >>
>> > Acked-by: Santosh Shilimkar <ssantosh@...nel.org>
>>
>> We no longer need i688? I do understand the need to cleanup the macros
>> for multi-arch etc.. but loosing a bug workaround for a real silicon
>> bug is really an invitation for hard to debug issues IMHO.
>
> Well that code has not been selectable for a few years now. Naturally
> we can add it back when it actually does something with multiarch.
>

I suppose we are sure that downstream kernels that actually try stuff
out never went ahead and enabled this.. we do have non multi-platform
builds as well... I am just saying... having been around during the
discovery of i688, I kinda know how much pain it takes to find the
damn thing in the first place. a simple boot was not ever an easy
enough test for it. I do suggest at least adding a print for omap4
saying that i688 is disabled..


-- 
---
Regards,
Nishanth Menon
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