linux-kernel - Re: linux-next: Tree for Dec 3 (mm/Kconfig)

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Message-ID: <alpine.DEB.2.02.1312051512490.7717@chino.kir.corp.google.com>
Date:	Thu, 5 Dec 2013 15:14:31 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Sima Baymani <sima.baymani@...il.com>
cc:	sfr@...b.auug.org.au, linux-next@...r.kernel.org,
	tangchen@...fujitsu.com, akpm@...ux-foundation.org,
	linux-mm@...ck.org, aquini@...hat.com,
	linux-kernel@...r.kernel.org, gang.chen@...anux.com,
	aneesh.kumar@...ux.vnet.ibm.com, isimatu.yasuaki@...fujitsu.com,
	kirill.shutemov@...ux.intel.com, sjenning@...ux.vnet.ibm.com,
	darrick.wong@...cle.com
Subject: Re: linux-next: Tree for Dec 3 (mm/Kconfig)

On Thu, 5 Dec 2013, Sima Baymani wrote:

> > CONFIG_HWPOISON_INJECT is unrelated, it already depends on CONFIG_PROC_FS.
> >
> > CONFIG_PROC_PAGE_MONITOR is obviously only useful for CONFIG_PROC_FS, so
> > the correct fix would be to make CONFIG_MEM_SOFT_DIRTY depend on
> > CONFIG_PROC_FS.
> >
> > Want to try sending a patch?
> 
> You bet!
> 
> However, I have the slightest confusion:
> I tested what you suggested by running "make oldconfig", and it does
> eliminate the error. However, I can't figure out why it's enough with
> adding the dependency for PROC_FS in MEM_SOFT_DIRTY, if
> PROC_PAGE_MONITOR depends on both?
> 

"select" will force the option to be selected regardless of its 
dependencies, so in this case you have CONFIG_MEM_SOFT_DIRTY set and
CONFIG_PROC_FS unset and CONFIG_MEM_SOFT_DIRTY enables PROC_PAGE_MONITOR 
which depends on CONFIG_PROC_FS.  The warning you're fixing shows the 
missing dependency.
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