for_each_page_ext(9)

💖 for_each_page_ext(9) 💖

okay bestie, welcome to the Kernel API Manual ✨ — this is the page for for_each_page_ext, and it's literally gonna walk you through every single page_ext object like a little tour guide. no cap. 🦋

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🌸 NAME 🌸

for_each_page_ext — iterate through page_ext objects.

like, all of them. one at a time. in order. periodt. 💅

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✨ SYNOPSIS ✨

for_each_page_ext (__page , __pgcount , __page_ext , __iter );

four args, that's it, you got this 🫶

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🎀 ARGUMENTS 🎀

• __page — the page we're interested in 👀 that's the starting point, the main character of this whole operation.
• __pgcount — how many pages to iterate through. so like, the size of the vibe check. 🔥
• __page_ext — a struct page_ext pointer, and this is where the current page_ext object gets returned to you. it's your little delivery slot, basically. 📬
• __iter — a struct page_ext_iter object, and here's the thing: it's defined in the stack. so you make it locally, bestie, don't go malloc-ing it. 🧚

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💜 DESCRIPTION 💜

IMPORTANT: must be called with RCU read lock taken. 😭 like, this is not optional, this is not a suggestion, this is the whole entire rule. take the RCU read lock first or everything is gonna be a mess and not in a cute way. 💀

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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_next(9)
• page_ext_iter_get(9)

go read those too, iykyk 🔥

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that's the page, bestie!! 🎀 and for the record, this lil icon comes straight out of ./include/linux and it's dated October 2026 ⭐ — so yeah, she's fresh. mwah 💋 💖🦋🌸👑