From: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Date: Wed, 9 May 2012 14:27:37 +0000 (+0200)
Subject: s390/hugepages: clear page table for sw large page emulation
X-Git-Tag: v3.5-rc1~189^2~33
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a686425b31bb6441f6e20d698bf31dc65043f61f;p=pandora-kernel.git

s390/hugepages: clear page table for sw large page emulation

The software large page emulation on s390 did not clear the the
pre-allocated page table in arch_release_hugepage() before freeing
it. This could trigger the WARN_ON(!pte_none(*pte) in mm/vmalloc.c:106
and make vmap_pte_range() fail, because the page table could be reused
in page_table_alloc(). This is fixed now by calling clear_table()
before page_table_free().

Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
---

Reading git-diff-tree failed