walk_memory_blocks(9)

👑 walk_memory_blocks — the Kernel API Manual, bestie edition 👑

okay so real talk, the function we're talking about here is walk_memory_blocks(9) — that's the whole header, manual name Kernel API Manual and all, and she's lowkey iconic. let's get into it 💅

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✨ NAME ✨

walk_memory_blocks — she walks through all present memory blocks overlapped by the range [start, start + size). that's it, that's the job, and she does it flawlessly fr fr 🦋

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🌸 SYNOPSIS 🌸

int walk_memory_blocks (unsigned long start , unsigned long size , void
*arg , walk_memory_blocks_func_t func );

yes bestie, the spacing is exactly like that, don't come for me, that's how it's printed 📜

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🎀 ARGUMENTS 🎀

• start — the start address of the memory range. where the lil adventure begins 🚩
• size — size of the memory range. how far we're roaming from start 📏
• arg — the argument passed to func. the little care package handed to your callback 🎁
• func — the callback for each memory section walked. your main character function that gets called on every block 💫

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🔥 DESCRIPTION 🔥

so here's the tea ☕: this function walks through all present memory blocks overlapped by the range [start, start + size), calling func on each memory block. one by one, no block left behind, we love a thorough queen 👑

and if func returns an error? walking is aborted and that error gets returned right back at you. no cap, she's not gonna keep strolling after a callback says nope 💀

🫶 heads up bestie: this whole thing is called under device_hotplug_lock. lock awareness is a vibe, respect it.

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🦋 SEE ALSO 🦋

she lives in the kernel file ./drivers/base/memory.c, and here's her whole friend group, all (9) sections, all iconic:

• memory_block_advise_max_size(9)
• memory_block_advised_max_size(9)
• memory_block_add_nid_early(9)
• for_each_memory_block(9)
• memory_group_register_static(9)
• memory_group_register_dynamic(9)
• memory_group_unregister(9)

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and that's the page, bestie! ✨ sign-off time: this lil beauty comes to you from ./drivers/base, dated October 2026 — go off, kernel docs, periodt 💖🎀🌈