for_each_mem_pfn_range(9)

📦 version 7.3.1, in nixpkgs unstable

💫 for_each_mem_pfn_range 💫

okay so bestie, welcome to the Kernel API Manual, section 9 — yes we're literally in the kernel docs and it's giving big-brain energy. this page is about for_each_mem_pfn_range, and no cap, it's a whole vibe once you get it.

✨ NAME ✨

for_each_mem_pfn_range — early memory pfn range iterator 🦋

like, it walks your early memory ranges for you so you don't have to. main character behavior fr fr.

🎀 SYNOPSIS 🎀

for_each_mem_pfn_range (i , nid , p_start , p_end , p_nid );

that's the whole invocation, slay. keep it exactly like that 💅

🌸 ARGUMENTS 🌸

  • i — an integer used as loop variable. yep, your classic loop counter, iconic, does exactly what it says 🔁
  • nid — node selector. pass MAX_NUMNODES if you want all the nodes, no picking favorites 💖
  • p_start — ptr to ulong for start pfn of the range. and good news: it can be NULL 🙈
  • p_end — ptr to ulong for end pfn of the range. also can be NULL, we love flexibility ✨
  • p_nid — ptr to int for nid of the range. can be NULL too, all three of the ptrs are optional like that 🫶

🔥 DESCRIPTION 🔥

Walks over configured memory ranges. that's it, that's the whole thing — lowkey simple, highkey useful 🌈

👑 SEE ALSO 👑

the kernel file is ./include/linux/memblock.h — go touch it, it's where the lore lives 📖 and also these absolute icons:

like, that's a whole friend group right there 💀💜

ngl bestie, just remember the ptrs can be NULL and MAX_NUMNODES means "all the nodes" — that's the whole vibe check ✅

and that's the page! sourced from ./include/linux, dated October 2026, and it's literally the for_each_mem_pfn_range(9) page. mwah, go iterate some pfns 💋🎀🌟

📦 where this page comes from