__devm_add_action(9)

🌸 __devm_add_action(9) 🌸

okay so bestie, we're in the Kernel API Manual today — yes, that manual, the big serious one — and the star of the show is __devm_add_action. lowkey a little legend. let's get into it 💅

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✨ NAME ✨

__devm_add_action — add a custom action to the list of managed resources 🎀

like, you're literally registering a little side-quest that the kernel will handle for you later. no cap.

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🦋 SYNOPSIS 🦋

int __devm_add_action (struct device *dev , void (*action)(void *) ,
void *data , const char *name );

she returns an int, she takes four args, she's booked and busy ✨

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💖 ARGUMENTS 💖

• dev — the Device that owns the action 👑 like, whose responsibility is this? hers.
• action — the Function that should be called. this is the function. it gets called. that's the whole vibe 🔥
• data — Pointer to data passed to the action implementation 🍓 handed straight to your callback, no detours.
• name — Name of the resource (for debugging purposes) 🔍 so when things go sideways at 3am you know which resource ghosted you. iykyk.

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🌈 DESCRIPTION 🌈

so what does she actually do? This adds a custom action to the list of managed resources so that it gets executed as part of standard resource unwinding. 🧚

translation for the group chat: you hand over your little cleanup function, the device takes custody of it, and when the standard unwinding happens, your action gets run — automatically. no manual cleanup arc, no forgotten free() trauma. main character energy, honestly. 💜

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⭐ SEE ALSO ⭐

okay this list is long long, but every single one of these is invited to the party — not me listing them all and skipping zero of them 🙈

Kernel file ./drivers/base/devres.c:

• __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_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)
• __devm_alloc_percpu(9)

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bestie bestie bestie — that SEE ALSO list is 28 entries long and i love her for it. go read a couple. or all of them. be the main character of your own devres journey 💅

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okay and finally the cute little sign-off because we do NOT skip the footer in this house 🫶: this page lives under ./drivers/base, and it's dated October 2026 — and yes, the title on the door is __devm_add_action(9), same as the one up top. slay, consistent queen 👑✨