set_pfnblock_bit(9)

📦 version 7.3.1, in nixpkgs unstable

💅 set_pfnblock_bit — like, the whole vibe

okay so real quick, bestie: this page lives in the Kernel API Manual (that's the manual name, not me being dramatic), and it's about one (1) tiny function. A single bit. That's it. That's the whole gig. And honestly? Iconic.

✨ NAME ✨

set_pfnblock_bit — sets a standalone bit of a pageblock 🎀

like, one bit. just the one. not a whole mask, not a whole type, a standalone bit. she's lowkey doing the bare minimum and we respect her for it.

🌸 SYNOPSIS 🌸

void set_pfnblock_bit (const struct page *page , unsigned long pfn ,
       enum pageblock_bits pb_bit );

returns nothing (void), takes three things, no cap. 🫶

🦋 ARGUMENTS 🦋

  • page — the page that's chilling inside the block of interest 💖 like, the block you care about. this is your anchor point.
  • pfn — the target page frame number. this is the frame whose bit is getting set. 🎯
  • pb_bit — which pageblock bit to set, as an enum pageblock_bits. pick your fav. 💅
ngl there's no exit status, no return value, no environment variables, no flags, no files touched — it's a void function and it's at peace with that. the drama is elsewhere. 😭

👑 SEE ALSO 👑

fr fr go read these next, they're all in the kernel file ./mm/page_alloc.c and they all have (9) energy:

that's the whole bestie roster, all 26 of them, no skipping, we don't do that here 🧚

also get_pfnblock_bit(9) and clear_pfnblock_bit(9) are literally right there if you want the read-and-clear versions. trio goals. 🌈

alright that's the page!! this little gem ships out of ./mm and it's dated October 2026 — so yeah, mark your calendar, she's from the future. drink water, go touch some pages, mwah 💜✨

📦 where this page comes from