page_ext_iter_next(9)

💅 page_ext_iter_next(9) — like, the Kernel API Manual page you didn't know you needed

okay bestie, so this is page_ext_iter_next(9) from the Kernel API Manual, and honestly? it's giving "small but mighty" ✨ it's the little iterator helper that gets you the next page extension, and yes you're gonna stan her.

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🌸 SYNOPSIS 🌸

struct page_ext * page_ext_iter_next (struct page_ext_iter *iter ,
unsigned long count );

that's the whole vibe. she takes an iterator and a count, she hands you back a struct page_ext *. no cap. 🫶

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🎀 ARGUMENTS 🎀

• iter — the page extension iterator itself, your main character 🦋
• count — the maximum number of page extensions to return. like, the absolute limit, bestie 💅

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✨ DESCRIPTION ✨

okay so listen: you must call this with the RCU read lock taken. not "should", not "maybe", not "if you feel like it" — must. 🔒 take the lock first, then come talk to her. this is a hard requirement and i'm not gonna sugarcoat it 💀

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🔥 RETURN 🔥

returns NULL if no next page_ext exists. that's it. that's the whole return section. when there's nothing left, you get NULL and you can go touch grass 🌱

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👑 SEE ALSO 👑

• Kernel file ./include/linux/page_ext.h
• struct page_ext_operations(9)
• page_ext_iter_begin(9)
• page_ext_iter_get(9)
• for_each_page_ext(9)

iykyk — go read page_ext_iter_begin(9) first if you're new here, she's the one who starts the whole thing 💖

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and that's the page, bestie 💜 sourced straight from ./include/linux, dated October 2026 — literally iconic, no notes 🎀✨💅