__devm_alloc_percpu(9)

✨ __devm_alloc_percpu(9) ✨

okay so bestie, welcome to the kernel API manual page for __devm_alloc_percpu 💅 this one lives in the Linux kernel docs and honestly? it's giving "tiny function, huge glow-up energy" 🎀

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🌸 NAME 🌸

__devm_alloc_percpu — resource-managed alloc_percpu 🫶

like, the alloc_percpu you already know and love, but with the devres babysitter attached ✨

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🦋 SYNOPSIS 🦋

void __percpu * __devm_alloc_percpu (struct device *dev , size_t size ,
       size_t align );

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💖 ARGUMENTS 💖

• dev — the device you're allocating this per-cpu memory for 👑 like, whose devres list is this gonna live on? that one.
• size — the size of the per-cpu memory you wanna allocate 🍓
• align — the alignment of the per-cpu memory you wanna allocate 📐 yes bestie, alignment matters, don't skip it

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⭐ DESCRIPTION ⭐

so it's a managed alloc_percpu 💫 and the whole slay of it is this: per-cpu memory allocated with this function is automatically freed on driver detach 🔥 no manual cleanup, no "oops I forgot to free it", no leak drama. the devres machinery handles it for you, periodt.

lowkey the most iconic thing about the devm family: you allocate, the driver detaches, it's gone. no cap 🙈

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🌈 RETURN 🌈

• pointer to the allocated memory on success 🎉
• NULL on failure 😭 (check it, bestie, always check it)

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🧚 SEE ALSO 🧚

kernel file ./drivers/base/devres.c — and the whole devres friend group, fr fr:

• __devres_alloc_node(9)
• devres_for_each_res(9)
• devres_free(9)
• devres_add(9)
• devres_find(9)
• devres_get(9)
• devres_remove(9)
• devres_destroy(9)
• devres_release(9)
• devres_release_all(9)
• devres_open_group(9)
• devres_close_group(9)
• devres_remove_group(9)
• devres_release_group(9)
• __devm_add_action(9)
• devm_remove_action_nowarn(9)
• devm_release_action(9)
• devm_kmalloc(9)
• devm_krealloc(9)
• devm_kstrdup(9)
• devm_kstrdup_const(9)
• devm_kvasprintf(9)
• devm_kasprintf(9)
• devm_kfree(9)
• devm_kmemdup(9)
• devm_kmemdup_const(9)
• devm_get_free_pages(9)
• devm_free_pages(9)

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okay but seriously bestie, if you're poking around in ./drivers/base then that list above is your reading list 💀 go be nosy, it's all connected iykyk

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and that's the whole page, mwah 💋 this lil guy is courtesy of the ./drivers/base section of the kernel docs, dated October 2026, and the page is literally titled __devm_alloc_percpu(9) — so next time you see that header floating around, you'll know exactly whose vibe it is 👑✨💜