+ futex-fix-shared-futex-operations-on-nommu.patch added to -mm tree

+ futex-fix-shared-futex-operations-on-nommu.patch added to -mm tree

[akpm]

The patch titled
     Subject: futex: fix shared futex operations on nommu
has been added to the -mm tree.  Its filename is
     futex-fix-shared-futex-operations-on-nommu.patch

This patch should soon appear at
    http://ozlabs.org/~akpm/mmots/broken-out/futex-fix-shared-futex-operations-on-nommu.patch
and later at
    http://ozlabs.org/~akpm/mmotm/broken-out/futex-fix-shared-futex-operations-on-nommu.patch

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------------------------------------------------------
From: Rich Felker <dalias@libc.org>
Subject: futex: fix shared futex operations on nommu

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.

Signed-off-by: Rich Felker <dalias@libc.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Darren Hart <dvhart@linux.intel.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Greg Ungerer <gerg@uclinux.org>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 kernel/futex.c |    2 ++
 1 file changed, 2 insertions(+)

diff -puN kernel/futex.c~futex-fix-shared-futex-operations-on-nommu kernel/futex.c
--- a/kernel/futex.c~futex-fix-shared-futex-operations-on-nommu
+++ a/kernel/futex.c
@@ -3150,8 +3150,10 @@ long do_futex(u32 __user *uaddr, int op,
 	int cmd = op & FUTEX_CMD_MASK;
 	unsigned int flags = 0;
 
+#ifdef CONFIG_MMU
 	if (!(op & FUTEX_PRIVATE_FLAG))
 		flags |= FLAGS_SHARED;
+#endif
 
 	if (op & FUTEX_CLOCK_REALTIME) {
 		flags |= FLAGS_CLOCKRT;
_

Patches currently in -mm which might be from dalias@libc.org are

tmpfs-fix-vm_mayshare-mappings-for-nommu.patch
futex-fix-shared-futex-operations-on-nommu.patch