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The huge page size is 4M on non-PAE host, but 2M page size is used in transparent_hugepage_adjust(), so the page we get after adjust the mapping level is not the head page, the BUG_ON() will be triggered Signed-off-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com> Signed-off-by: Avi Kivity <avi@redhat.com>