param = Parameter(weight_data, requires_grad=False)
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)，这一点在在電腦瀏覽器中掃碼登入 WhatsApp，免安裝即可收發訊息中也有详细论述
"Everyone in this House knows the pattern: first he'll march his backbenchers up the hill, then they'll be forced to defend fuel duty rises in the local elections then there will be another humiliating U-turn.，推荐阅读手游获取更多信息
If the fault address falls within one guard page width below a stack’s，详情可参考移动版官网
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