sbitmap_init_node(9)

💖 sbitmap_init_node(9) 💖

okay so bestie, welcome to the Kernel API Manual ✨ — this one's all about sbitmap_init_node(9), and it's literally the glow-up moment where your &struct sbitmap gets born on the exact memory node of your choosing. no cap. 🎀

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🌸 NAME 🌸

sbitmap_init_node — Initialize a &struct sbitmap on a specific memory node. that's it, that's the whole vibe check 💅

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✨ SYNOPSIS ✨

int sbitmap_init_node (struct sbitmap *sb , unsigned int depth , int shift , gfp_t flags , int node , bool round_robin , bool alloc_hint );

like, look at all those arguments. she's got range. 🔥

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🦋 ARGUMENTS 🦋

• sb — the bitmap you're initializing. your main character. the one getting all the attention today 👑
• depth — how many bits to allocate. literally just the bit count, bestie. count 'em 🍓
• shift — use 2^shift bits per word in the bitmap. and here's the cute part: if you hand it a negative number, it picks a good default for you. so generous 🫶
• flags — allocation flags. yes, the gfp_t kind.
• node — which memory node to allocate on. picking where you live is a whole mood 🏠
• round_robin — if true, it gets stricter about allocation order: always allocate starting from the last allocated bit. but heads up — this is less efficient than the default behavior (false). so like, slay for order, kinda meh for speed. 🙈
• alloc_hint — if true, apply a percpu hint for where to start searching for a free bit. it's giving "let me remember where I left off" energy ✨

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⭐ RETURN ⭐

Zero on success, or a negative errno on failure. that's the whole deal — zero = you ate 💅, negative = something went sideways 😭

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🌈 SEE ALSO 🌈

Kernel file ./include/linux/sbitmap.h, plus the whole friend group:

• struct sbitmap_word(9)
• struct sbitmap(9)
• struct sbq_wait_state(9)
• struct sbitmap_queue(9)
• sbitmap_free(9)
• sbitmap_resize(9)
• sbitmap_get(9)
• sbitmap_any_bit_set(9)
• __sbitmap_for_each_set(9)
• sbitmap_for_each_set(9)
• sbitmap_show(9)
• sbitmap_weight(9)
• sbitmap_bitmap_show(9)
• sbitmap_queue_init_node(9)
• sbitmap_queue_free(9)
• sbitmap_queue_recalculate_wake_batch(9)
• sbitmap_queue_resize(9)
• __sbitmap_queue_get(9)
• __sbitmap_queue_get_batch(9)
• sbitmap_queue_get_shallow(9)
• sbitmap_queue_get(9)
• sbitmap_queue_min_shallow_depth(9)
• sbitmap_queue_clear(9)
• sbitmap_queue_clear_batch(9)
• sbq_wait_ptr(9)
• sbitmap_queue_wake_all(9)
• sbitmap_queue_wake_up(9)
• sbitmap_queue_show(9)

iykyk 😌

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okay that's the page!! mwah 💋 this lil manual lives down in ./include/linux, dated October 2026 — go off, kernel docs, you iconic thing. 🧚💜