STRUCT SBITMAP_WORD(9)

✨ struct_sbitmap_word(9) ✨

okay so bestie, welcome to the Kernel API Manual entry for struct sbitmap_word — it's a thing, it's iconic, and you're gonna get it. Let's go 💅

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🌸 NAME 🌸

struct sbitmap_word — literally just a word in a &struct sbitmap. that's the whole vibe. periodt.

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🎀 SYNOPSIS 🎀

struct sbitmap_word {
    unsigned long word;
    unsigned long cleared;
    raw_spinlock_t swap_lock;
 };

three fields. no more, no less. she's simple, she's efficient, she's giving main character energy in the smallest way possible 🦋

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💖 Members 💖

• word — the word that's holding the free bits. yes bestie, this is where the "what's available" lives 🫶
• cleared — the word holding the cleared bits. keeping receipts of what's been cleared, ngl that's very organized of her 💀
• swap_lock — a lock that serializes simultaneous updates of ->word and ->cleared. so like, if two threads try to touch both at once? she says one at a time, please 🙈

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🌈 SEE ALSO 🌈

the whole friend group 💜 — this struct does not exist alone, she's part of a whole ecosystem:

Kernel file ./include/linux/sbitmap.h, plus:

• struct sbitmap(9)
• struct sbq_wait_state(9)
• struct sbitmap_queue(9)
• sbitmap_init_node(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)

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and that's the page bestie, you ATE that reading session 🍓 this one came from the kernel source at ./include/linux and it's dated October 2026 — so go forth and be the most knowledgeable person in the group chat, iykyk 🔥👑

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