linux-kernel - Re: [PATCH 2/2] init/Kconfig: Fix HAVE_FUTEX_CMPXCHG to not break up the EXPERT menu

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Date:	Fri, 03 Oct 2014 16:36:36 -0700
From:	Randy Dunlap <rdunlap@...radead.org>
To:	Josh Triplett <josh@...htriplett.org>,
	"Yann E. MORIN" <yann.morin.1998@...e.fr>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Eric Paris <eparis@...hat.com>, Michal Hocko <mhocko@...e.cz>,
	Matt Turner <mattst88@...il.com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	蔡正龙 <zhenglong.cai@...c.com.cn>,
	Tejun Heo <tj@...nel.org>, Fabian Frederick <fabf@...net.be>,
	"Luis R. Rodriguez" <mcgrof@...e.com>,
	Peter Foley <pefoley2@...oley.com>,
	Konstantin Khlebnikov <koct9i@...il.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"H. Peter Anvin" <hpa@...or.com>, Oleg Nesterov <oleg@...hat.com>,
	linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] init/Kconfig: Fix HAVE_FUTEX_CMPXCHG to not break
 up the EXPERT menu

On 10/03/14 16:31, Josh Triplett wrote:
> commit 03b8c7b623c80af264c4c8d6111e5c6289933666 ("futex: Allow
> architectures to skip futex_atomic_cmpxchg_inatomic() test") added the
> HAVE_FUTEX_CMPXCHG symbol right below FUTEX.  This placed it right in
> the middle of the options for the EXPERT menu.  However,
> HAVE_FUTEX_CMPXCHG does not depend on EXPERT or FUTEX, so Kconfig stops
> placing items in the EXPERT menu, and displays the remaining several
> EXPERT items (starting with EPOLL) directly in the General Setup menu.
> 
> Since both users of HAVE_FUTEX_CMPXCHG only select it "if FUTEX", make
> HAVE_FUTEX_CMPXCHG itself depend on FUTEX.  With this change, the
> subsequent items display as part of the EXPERT menu again; the EMBEDDED
> menu now appears as the next top-level item in the General Setup menu,
> which makes General Setup much shorter and more usable.
> 
> Signed-off-by: Josh Triplett <josh@...htriplett.org>
> ---
> 
> Posting for review.  I can upstream this through the tiny tree.
> 
> Personally, I'd consider this a bit of a bug in Kconfig; ideally,
> Kconfig should only consider symbols with prompt strings when
> considering what to display in a menu.  However, in the interim, this
> one-line patch drastically improves the usability of the "General Setup"
> config menu.

Good catch.  Thanks.

I would prefer to see both of your patches merged quickly into 3.17 no matter
how they get there.

both patches:
Acked-by: Randy Dunlap <rdunlap@...radead.org>


>  init/Kconfig | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/init/Kconfig b/init/Kconfig
> index 31505a5..80a6907 100644
> --- a/init/Kconfig
> +++ b/init/Kconfig
> @@ -1477,6 +1477,7 @@ config FUTEX
>  
>  config HAVE_FUTEX_CMPXCHG
>  	bool
> +	depends on FUTEX
>  	help
>  	  Architectures should select this if futex_atomic_cmpxchg_inatomic()
>  	  is implemented and always working. This removes a couple of runtime
> 


-- 
~Randy
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