What is the meaning of "Enter into al-silm altogether"?

Imām Ibn al-Jawzī (d. 597/1201) summarized the scholars' opinions in his book "Zād al-Masīr" as follows:

1. It refers to Islam. [Ibn ʿAbbās, ʿIkrimah, Qatādah, al-Ḍaḥḥāk, al-Suddī, Ibn Qutaybah, al-Zajjāj]
2. It refers to obedience. [Abū al-ʿĀliyah, al-Rabīʿ, also reported from Ibn ʿAbbās ]