devm_kstrdup_const(9)

💅 devm_kstrdup_const(9) — from the Kernel API Manual, bestie

okay so we're in the Kernel API Manual today and the star of the show is devm_kstrdup_const ✨ it's that girl who duplicates your string, but only when she has to, and then cleans up after herself. very demure, very mindful.

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✨ NAME ✨

devm_kstrdup_const — resource managed conditional string duplication 🎀

like, it duplicates a string, but conditionally, and it's managed by the device resource system. the whole package fr fr.

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🌸 SYNOPSIS 🌸

const char * devm_kstrdup_const (struct device *dev , const char *s ,
gfp_t gfp );

that's the whole signature, no notes 👑

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🦋 ARGUMENTS 🦋

• dev — the device you're duplicating the string for. it's the main character here, everything gets tied to it 🫶
• s — the string to duplicate. the actual content, the moment, the vibe 💜
• gfp — the GFP mask used in the kmalloc call when allocating memory. yes she does actually call kmalloc, we'll get to that 🌈

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💖 DESCRIPTION 💖

so here's the tea ☕ — anything allocated by devm_kstrdup_const gets automatically freed when the associated device is detached. no manual kfree, no leak anxiety, no 3am debugging session. the devres system handles it. periodt 💅

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⭐ RETURN ⭐

you get the source string itself back if it lives in the .rodata section — no allocation, she just points at it, iconic — otherwise it falls back to devm_kstrdup. so it's giving "I'll only do work if I genuinely have to" 😭🔥

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👑 SEE ALSO 👑

the kernel file ./drivers/base/devres.c and honestly the whole devres friend group:

• __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_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)

go read them, iykyk 📚💫

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ngl bestie, .rodata means your string is literally constant forever, so duplicating it would be a whole waste of a kmalloc. that's exactly why this function exists. no cap 🙈

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okk that's the whole page!! brought to you from ./drivers/base, dated October 2026, and the page itself is devm_kstrdup_const(9) — slay, go free your strings (or don't, she's already handled 💅🌸💖)