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Date: Wed, 9 Mar 2016 14:08:40 +0100
From: Ingo Molnar <mingo@kernel.org>
To: "Kirill A. Shutemov" <kirill@shutemov.name>
Cc: Borislav Petkov <bp@suse.de>,
        Linus Torvalds <torvalds@linux-foundation.org>,
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Subject: Re: [RFC] CONFIG_FORCE_MINIMALLY_SANE_CONFIG=y (was: Re: [RFC PATCH]
 x86/kconfig: Sanity-check config file during oldconfig)
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* Kirill A. Shutemov <kirill@shutemov.name> wrote:

> On Tue, Jan 19, 2016 at 09:20:22AM +0100, Ingo Molnar wrote:
> > +	select SYSFS_DEPRECATED
> ...
> 
> > And yes, many of these options are members of the 'SystemD debuggability Hall Of 
> > Shame'... It cost me many, many days of painful config-bisection to figure the 
> > often obscure dependencies out, so we might as well upstream this information.
> 
> And you've got it wrong ;)
> 
> http://cgit.freedesktop.org/systemd/systemd/tree/README#n54
> 
>         udev will fail to work with the legacy sysfs layout:
> 	          CONFIG_SYSFS_DEPRECATED=n

That's with new systemd. The Fedora 19 system I tested it on certainly failed in 
the way I documented it.

So we now have a kernel option that breaks older SystemD if unset, and breaks 
newer SystemD if set.

Bravo!

Thanks,

	Ingo