From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Thu, 12 Dec 2013 17:38:42 +0000 (-0800)
Subject: futex: fix handling of read-only-mapped hugepages
X-Git-Tag: v3.2.54~45
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=96e7025c23fe7d09401edbfa8990144cbf8dc93b;p=pandora-kernel.git

futex: fix handling of read-only-mapped hugepages

commit f12d5bfceb7e1f9051563381ec047f7f13956c3c upstream.

The hugepage code had the exact same bug that regular pages had in
commit 7485d0d3758e ("futexes: Remove rw parameter from
get_futex_key()").

The regular page case was fixed by commit 9ea71503a8ed ("futex: Fix
regression with read only mappings"), but the transparent hugepage case
(added in a5b338f2b0b1: "thp: update futex compound knowledge") case
remained broken.

Found by Dave Jones and his trinity tool.

Reported-and-tested-by: Dave Jones <davej@fedoraproject.org>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Darren Hart <dvhart@linux.intel.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

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