The caller provides context and modifies the behavior of get_user_pages() via flags. Of particular interest is the FOLL_FORCE flag, which mem_rw() passes. This flag causes check_vma_flags (the access validation logic within get_user_pages()) to ignore writes to unwritable pages and allow the lookup to continue. The “punch through” semantics are attributed entirely to FOLL_FORCE. (comments my own)
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陈玮介绍，过去，尘肺病往往与采矿业联系在一起。但现在，在家装和台面切割等行业，也出现了一批新的尘肺病患者。