__set_pfnblock_flags_mask(9)

📦 version 7.3.1, in nixpkgs unstable

💅 __set_pfnblock_flags_mask — Kernel API Manual energy, bestie

okay so like. welcome to the Kernel API Manual, bestie 🎀 and today's main character is __set_pfnblock_flags_mask — say that five times fast, i dare you 😭 this one is literally the "set the flags" girlie for a whole block of pages, no cap.

✨ NAME ✨

__set_pfnblock_flags_mask — set the requested group of flags for a pageblock_nr_pages block of pages 🦋

like. it's giving "i flip the bits you asked for, on an entire pageblock, and nothing else." periodt.

🌸 SYNOPSIS 🌸

void __set_pfnblock_flags_mask (struct page *page , unsigned long pfn ,
       unsigned long flags , unsigned long mask );

returns nothing, void, zero notes, she just does the thing and leaves 💅

💖 ARGUMENTS 💖

  • page — the page within the block of interest 👑 like it's your entry point into the block, the vibe check that tells you which block we're even talking about.
  • pfn — the target page frame number 🔥 the actual number-number of the page we're pointing at.
  • flags — the flags to set ✨ the bits you want turned on, bestie.
  • mask — mask of bits that the caller is interested in 🌈 so you're saying "only this group of bits matters to me," and the rest of the world can stay unbothered.
fr fr: flags is what you wanna set, mask is which bits you're allowed to touch. keep those two straight and you're golden 💜

🎀 SEE ALSO 🎀

the whole friend group came out for this one, i'm obsessed 😭 all of these are from the kernel file ./mm/page_alloc.c:

and that's the whole page, bestie 🫶 go set some flags, stay iconic, drink water 💧

this lil masterpiece lives in ./mm, dated October 2026, and it's filed under __set_pfnblock_flags_mask(9) — mwah 💋

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