linux-kernel - page table questions

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Date:   Wed, 7 Jun 2017 13:24:11 +0800
From:   meng chen <cmhanjey@...il.com>
To:     linux 内核邮件列表 
        <linux-kernel@...r.kernel.org>
Subject: page table questions

hello ,how to know wheather a pmd maps a 2M physical page or not??
if(pmd_trans_huge(*pmd)){
    if(pte_present(*pmd)){
            /*page is in ram?*/
      }
}

can I judge it according the above codes??
thanks a lot!!