But having studied historical materials from Japan and Tunhuang, Dr. Hu Shih, that most cautious of scholars, concluded that the claim that Bodhidharma became the 28th patriarch of the Ch'an school was fabricated by the Northern Sung monk Ch'i-sung.
但是經過「有幾分證據，講幾分話」的胡適博士考證，根據日本保存的資料以及敦煌的史料，達摩傳承禪宗廿八代的說法，是北宋契嵩和尚的偽作。