for_each_cle...itrange_from(9)

💅 for_each_clear_bitrange_from(9) — like, the whole kernel API manual page, bestie

okay so this is from the Kernel API Manual, section 9 (for_each_cle...itrange_from(9) — yes the title is truncated, no I didn't do that, that's just how it's printed 💀). Buckle up, we're going bit-by-bit and it's gonna slay.

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✨ NAME ✨

for_each_clear_bitrange_from — iterate over all unset bit ranges [b; e)

that's it. that's the whole vibe. we're walking through every stretch of zeros in a bitmap, starting from a spot you pick. iconic behavior honestly 🫶

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🦋 SYNOPSIS 🦋

for_each_clear_bitrange_from (b , e , addr , size );

look at that spacing. don't touch it. it's canon. 💅

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🌸 ARGUMENTS 🌸

• b — bit offset of the start of the current bitrange (the first unset bit), and listen: it must be initialized. like, you have to set it before you go. no cap, it's not optional, don't come crying to me if you skip it 😭
• e — bit offset of the end of the current bitrange (the first set bit). that's where the run of zeros stops, bestie.
• addr — bitmap address to base the search on. this is the actual bitmap you're digging through 🎀
• size — bitmap size in number of bits. yes, bits, not bytes, read it again 🙈

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👑 SEE ALSO 👑

fr fr go read these too, they're all in the kernel file ./include/linux/find.h and honestly the whole friend group is here:

• find_next_bit(9)
• find_next_and_bit(9)
• find_next_andnot_bit(9)
• find_next_or_bit(9)
• find_next_zero_bit(9)
• find_first_bit(9)
• find_nth_bit(9)
• find_nth_and_bit(9)
• find_nth_and_andnot_bit(9)
• find_first_and_bit(9)
• find_first_andnot_bit(9)
• find_first_and_and_bit(9)
• find_first_zero_bit(9)
• find_last_bit(9)
• find_next_and_bit_wrap(9)
• find_next_bit_wrap(9)
• find_next_clump8(9)
• for_each_set_bitrange(9)
• for_each_set_bitrange_from(9)
• for_each_clear_bitrange(9)
• for_each_set_bit_wrap(9)
• for_each_set_clump8(9)

that's twenty-two entries, every single one of them, I counted twice so you don't have to 🧚

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lowkey a reminder: b being uninitialized is the classic oopsie here. the docs literally say "must be initialized" — that's not me being dramatic, that's the spec 💀

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okay that's the page!! mwah 💖 it lives under ./include/linux, and this particular printing is dated October 2026 — so like, future vibes. anyway, for_each_cle...itrange_from(9), that's a wrap, go iterate responsibly ✨🎀🦋