for_each_clear_bitrange(9)

✨ for_each_clear_bitrange ✨

okay so real talk bestie, welcome to the Kernel API Manual — section 9 for all my fellow kernel girlies out there 💅 this one's about for_each_clear_bitrange, and it's honestly such a vibe once you get it.

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🌸 NAME 🌸

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

like, all of them. every single little stretch of zeroes. no bit left behind, fr fr.

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🦋 SYNOPSIS 🦋

for_each_clear_bitrange (b , e , addr , size );

that's the whole thing. four args, one macro, infinite potential ✨

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💖 ARGUMENTS 💖

• b — bit offset of start of current bitrange (first unset bit). so like, where the clear zone begins 👑
• e — bit offset of end of current bitrange (first set bit). where it ends, and yes, the [b; e) half-open thing means e is not included, periodt 💅
• addr — bitmap address to base the search on. your actual bitmap, the main character of this whole operation 🌟
• size — bitmap size in number of bits. how far the search is allowed to wander, ngl don't let it roam past this 🙈

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🔥 SEE ALSO 🔥

bestie there are SO many siblings in this family, it's giving huge family reunion energy 😭 all chillin' in the Kernel file ./include/linux/find.h:

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_from(9), for_each_set_bit_wrap(9), for_each_set_clump8(9)

go read them all, iykyk 🧚‍♀️ honestly iconic of them to all live together like that.

lowkey a reminder: if you ever need the set bits instead of the clear ones, that's a whole different macro (for_each_set_bitrange), so don't mix them up bestie 💀

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okay that's the page!! mwah 🫶 this dropped in ./include/linux, in the October 2026 era, and yes — this page is literally called for_each_clear_bitrange(9). slay, bye 💜🍓