linux-kernel - Re: [PATCH] futex: fix shared futex operations on nommu

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Message-ID: <20160426095552.GB8295@linutronix.de>
Date:	Tue, 26 Apr 2016 11:55:52 +0200
From:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:	Rich Felker <dalias@...c.org>
Cc:	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Davidlohr Bueso <dave@...olabs.net>,
	Ingo Molnar <mingo@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Darren Hart <dvhart@...ux.intel.com>,
	Mel Gorman <mgorman@...e.de>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Greg Ungerer <gerg@...inux.org>,
	Steven Miao <realmz6@...il.com>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Yoshinori Sato <ysato@...rs.sourceforge.jp>
Subject: Re: [PATCH] futex: fix shared futex operations on nommu

* Rich Felker | 2016-04-25 21:03:03 [-0400]:

>The shared get_futex_key code does not work on nommu, but is not
>needed anyway because it's impossible for a given backing to have
>multiple distinct virtual addresses on nommu. Simply disable these
>code paths by refraining from setting FLAG_SHARED when CONFIG_MMU is
>not enabled.

by disabling it you are not fixing it.
Why isn't it working? Why does it pop up now and not earlier?

Sebastian