page_slab(9)

💅 page_slab(9) — the Kernel API Manual, bestie edition ✨

okay so real talk: this is page_slab(9) from the Kernel API Manual, and it's literally the glow-up translator between struct page and struct slab. it's giving "who dis" energy but for kernel memory. 🦋

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✨ SYNOPSIS ✨

struct slab * page_slab (const struct page *page );

one function, one job, no cap.

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🎀 ARGUMENTS 🎀

• page — a page which may or may not belong to a slab. like, it's not committed yet, okay? it could be a slab page, it could be a random page living its best life. we don't know until we ask. 🙈

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🔥 RETURN 🔥

so here's the tea: you get back the slab which contains this page, or NULL if the page does not belong to a slab. 💀

and yes, that NULL case is important — it includes pages returned from large kmalloc. so if you got a big kmalloc allocation back, don't go assuming it's a slab page, bestie, because it's not. NULL is the vibe check telling you "not for you, girl." 😭

🫶 fr fr: always handle the NULL. no cap. that's the whole plot twist.

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🌈 SEE ALSO 🌈

• Kernel file ./mm/slab.h
• slab_folio(9)
• slab_page(9)

iykyk 💜

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✨ that's the whole page, mwah ✨ — source dir ./mm, dated October 2026, and the header/footer both literally just say page_slab(9) because the kernel API manual knows exactly who it is 👑💅