kmsan_iounmap_page_range(9)

📦 version 7.3.1, in nixpkgs unstable

💅 kmsan_iounmap_page_range — bestie, it's KMSAN cleanup time

Okay so real quick, this is section 9 of the Kernel API Manual, the kmsan_iounmap_page_range page, and honestly? It's a short one. A cute little one. Let's get into it 🎀

✨ NAME ✨

kmsan_iounmap_page_range — the function that pops into KMSAN's DMs to let it know a iounmap_page_range() call is happening. That's it. That's the job. She's a notifier, she's a messenger, she's not doing the actual unmapping herself 💅

🌸 SYNOPSIS 🌸

void kmsan_iounmap_page_range (unsigned long start , unsigned long end );

Returns void, so there's literally nothing coming back to you. No errors, no status, nothing. She does her thing and she's gone 👑

🦋 ARGUMENTS 🦋

  • start — where the range starts, bestie. The beginning. The alpha. The unsigned long in question 💖
  • end — where the range ends. The finish line. Also an unsigned long, also important, don't skip her 🫶

💜 DESCRIPTION 💜

So here's the tea: KMSAN unmaps the metadata pages for the given range. And — this is the part where it's lowkey different from her cousin — unlike for vunmap_page_range, she also deallocates them. The way that's a whole extra step is giving main character energy, ngl. Not just unmapped, but freed. Both. She ate 🍓

⭐ SEE ALSO ⭐

Kernel file ./include/linux/kmsan.h, plus the whole KMSAN friend group chat, and we're @-ing every single one of them, no cap:

💀 Heads up: this page lives under ./include/linux in the source tree — that's where you'll find her, iykyk.

Alright bestie, that's the whole page, and yes she's short, but she's iconic 🌈 This one comes from ./include/linux, dated October 2026, and that's the whole sign-off — mwah 💖🧚‍♀️🌸

📦 where this page comes from