From: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Date: Thu, 29 Nov 2012 21:54:34 +0000 (-0800)
Subject: mm: soft offline: split thp at the beginning of soft_offline_page()
X-Git-Tag: v3.2.35~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=65a777980f38d7f80eb726aec2572580fb9a267d;p=pandora-kernel.git

mm: soft offline: split thp at the beginning of soft_offline_page()

commit 783657a7dc20e5c0efbc9a09a9dd38e238a723da upstream.

When we try to soft-offline a thp tail page, put_page() is called on the
tail page unthinkingly and VM_BUG_ON is triggered in put_compound_page().

This patch splits thp before going into the main body of soft-offlining.

Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Andi Kleen <andi.kleen@intel.com>
Cc: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

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