devres_open_group(9)

💖 devres_open_group(9) — from the Kernel API Manual, bestie 💖

Okay so we're deep in the kernel docs today, specifically the devres_open_group(9) page, and honestly? It's giving "small function, big responsibilities." Let's get into it ✨

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🌸 NAME 🌸

devres_open_group — literally just "Open a new devres group." Short king. We stan a concise icon 💅

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🎀 SYNOPSIS 🎀

void * devres_open_group (struct device *dev , void *id , gfp_t gfp );

Three args, one pointer back. No cap, that's the whole signature 🫶

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🦋 ARGUMENTS 🦋

• dev — the Device you're opening a devres group for. Like, the whole reason we're here 💖
• id — the Separator ID. Yes bestie, it's called that. It separates. It IDs. It's iconic 👑
• gfp — Allocation flags. You know the drill, the flags that tell the allocator how to behave 🌈

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⭐ DESCRIPTION ⭐

So what does it actually do? It opens a new devres group for dev with id. Simple. Clean. Periodt.

Now, about that id — the docs have an actual recommendation and I need you to hear it: using a pointer to an object which won't be used for another group is recommended. Translation? Don't be messy with your IDs, bestie 🙈 Give each group its own little identity so nothing gets confused.

And if id is NULL? Not a problem, not a crisis — an address-wise unique ID is created. The kernel's got you, it'll make one for you 🧚✨

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🔥 RETURN 🔥

• Returns the ID of the new group 🎉
• Returns NULL on failure 💀

So like, always check it. Fr fr.

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💜 SEE ALSO 💜

Okay this list is long and I'm obsessed with the commitment — here's the whole squad, no one left behind:

• The 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_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)
• __devm_alloc_percpu(9)

Read them all, iykyk 📚💅

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Quick vibe check: you did remember that id should be a pointer to something not reused for another group, right? Because that's the one thing the docs went out of their way to recommend. Don't make it weird 🙈

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And that's the page, bestie! Brought to you by the fine folks over at ./drivers/base, dated October 2026, and honestly? They ate with this one 👑✨ 🎀