From: Christoph Lameter <cl@linux.com>
Date: Mon, 16 May 2011 20:26:08 +0000 (-0500)
Subject: slub: Make CONFIG_DEBUG_PAGE_ALLOC work with new fastpath
X-Git-Tag: v2.6.39.1~73
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=440316e6310c2ce372e32d12c83ccc8ddcfb5028;p=pandora-kernel.git

slub: Make CONFIG_DEBUG_PAGE_ALLOC work with new fastpath

commit 1393d9a1857471f816d0be1ccc1d6433a86050f6 upstream.

Fastpath can do a speculative access to a page that CONFIG_DEBUG_PAGE_ALLOC may have
marked as invalid to retrieve the pointer to the next free object.

Use probe_kernel_read in that case in order not to cause a page fault.

Reported-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

Reading git-diff-tree failed