of_reserved_...region_count(9)

💖 of_reserved_...region_count(9) 💖

okay so bestie, welcome to the Kernel API Manual — yes that's the manual name, we're fancy here — and today's main character is of_reserved_mem_region_count. it's giving niche kernel lore but honestly? kinda iconic. let's get into it 🫶

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✨ NAME ✨

of_reserved_mem_region_count — literally just returns the number of 'memory-region' entries. that's it. that's the whole gig. no cap. 💅

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🌸 SYNOPSIS 🌸

int of_reserved_mem_region_count (const struct device_node *np );

like, you hand it a node, it hands you back an int. simple as. 🎀

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🦋 ARGUMENTS 🦋

• np — the node that's holding the 'memory-region' property. that's the one you're counting entries on, bestie. give it the right node or don't come crying to me 😭

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🔥 DESCRIPTION 🔥

so this function lets drivers retrieve the number of entries for a node's — and yes, the sentence just kinda trails off there in the original, we don't make the rules, we just vibe with them 🙈

it returns the number of entries on success, or a negative error code on a malformed property. so like, if the property's messed up, you're not getting a cute little number back, you're getting a negative error code and you need to handle that. don't ignore it, that's not slay behaviour 💀

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💜 SEE ALSO 💜

kernel file, right here:

./drivers/of/of_reserved_mem.c

and the whole friend group — these ones belong together, iykyk:

• fdt_scan_reserved_mem_late(9)
• fdt_fixup_reserved_mem_node(9)
• fdt_validate_reserved_mem_node(9)
• __reserved_mem_init_node(9)
• fdt_init_reserved_mem_node(9)
• of_reserved_mem_device_init_by_idx(9)
• of_reserved_mem_device_init_by_name(9)
• of_reserved_mem_device_release(9)
• devm_of_reserved_mem_device_init(9)
• of_reserved_mem_lookup(9)
• of_reserved_mem_region_to_resource(9)
• of_reserved_mem_region_to_resource_byname(9)

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lowkey a whole reserved-mem cinematic universe going on here. go read them all, bestie, they're all connected 💖

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and that's the page!! it lives at ./drivers/of, it's dated October 2026, and the manual title is of_reserved_...region_count(9) — yes the header truncates the name with ..., it's giving mysterious, it's giving ✨elusive✨, we stan. bye bestie, mwah 🧚💜