get_dump_page(9)

💖 get_dump_page — the kernel API manual, but make it make sense 💖

okay so bestie, welcome to the get_dump_page(9) page 💅 this one lives in the Kernel API Manual, section 9 — we're in kernel-dev territory now, no cap.

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✨ NAME ✨

get_dump_page — pin a user page in memory while you're writing it out to a core dump 🫶

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🌸 SYNOPSIS 🌸

struct page * get_dump_page (unsigned long addr , int *locked );

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🦋 ARGUMENTS 🦋

• addr — the user address. literally the address, that's the whole vibe 📍
• locked — a pointer to an int that says whether the mmap sem is held 👀

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🎀 DESCRIPTION 🎀

So this one returns a struct page pointer for a user page that's pinned for the dump — and when you're done with it, you free it afterwards with put_page 🧚

It returns NULL on any kind of failure — and when that happens you must insert a hole into the corefile, because you gotta preserve alignment with its headers, fr fr. It also returns NULL wherever the ZERO_PAGE has been found, or an anonymous pte_none — which is actually a slay, because that lets you leave a hole in the corefile and save disk space 🌈

ngl it's called without mmap_lock — it takes and releases the mmap_lock by itself, main character energy, it handles its own business 💅

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👑 SEE ALSO 👑

All these icons live in the kernel file ./mm/gup.c 🔥

• try_grab_folio(9)
• unpin_user_page(9)
• unpin_folio(9)
• folio_add_pin(9)
• unpin_user_pages_dirty_lock(9)
• unpin_user_page_range_dirty_lock(9)
• unpin_user_pages(9)
• unpin_user_folio(9)
• unpin_folios(9)
• try_grab_folio_fast(9)
• follow_page_mask(9)
• __get_user_pages(9)
• fixup_user_fault(9)
• populate_vma_page_range(9)
• fault_in_writeable(9)
• fault_in_subpage_writeable(9)
• fault_in_readable(9)
• get_user_pages_remote(9)
• get_user_pages(9)
• get_user_pages_fast_only(9)
• get_user_pages_fast(9)
• pin_user_pages_fast(9)
• pin_user_pages_remote(9)
• pin_user_pages(9)
• memfd_pin_folios(9)
• folio_add_pins(9)

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and that's the whole page, bestie, you ate that 🍓 this cutie came out of ./mm, dated October 2026, and it's from the Kernel API Manual, section 9 — that's get_dump_page(9) for the group chat 💜 mwah 🎀✨