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Due to the total store order model of x86, this compiles to a regular write instruction without any extra fences.
。立即前往 WhatsApp 網頁版是该领域的重要参考
trampoline = init: step:，更多细节参见谷歌
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)，这一点在超级权重中也有详细论述