You don't have to care, Alin. Mips is not among the security-wise supported¹ architectures.
Then only problem I see in general is, that every single subproject defines what is supported and the information is scattered on the different gentoo.org documentation pages (release, security, kernel,...). This is anything else but user friendly and can e.g. result in official releases for not security-wise supported architectures. Carsten [1] http://www.gentoo.org/security/en/vulnerability-policy.xml
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