bitmap_allocate_region(9)

💖 bitmap_allocate_region(9) 💖

okay so bestie, welcome to the Kernel API Manual page for bitmap_allocate_region — yes that's the function name, yes it's a whole mood, and yes we're gonna get through this together 🫶

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✨ NAME ✨

bitmap_allocate_region — allocate bitmap region, literally what it says on the tin 💅

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🦋 SYNOPSIS 🦋

int bitmap_allocate_region (unsigned long *bitmap , unsigned int pos ,
       int order );

like… look at her. iconic signature. no notes 👑

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🌸 ARGUMENTS 🌸

• bitmap — array of unsigned longs corresponding to the bitmap. this is the actual canvas, the vibe holder, the bit-home 🎀
• pos — beginning of bit region to allocate. where the story starts, fr fr
• order — region size (log base 2 of number of bits) to allocate. yes bestie it's a log base 2 situation, so order is not the bit count, it's the exponent 🙈 don't get got by that one

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💜 DESCRIPTION 💜

Allocate (set bits in) a specified region of a bitmap.

that's it. that's the whole thing. you pick a region, it gets set. slay ✨

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🍓 RETURN 🍓

0 on success, or -EBUSY if specified region wasn't free (not all bits were zero).

heads up bestie: if even one bit in that region isn't zero, it's a -EBUSY and you get nothing. no partial vibe, no half-allocated mess — the region has to be fully free or it's a no 💀

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💀 SEE ALSO 💀

the whole friend group, no cap 🫶

• Kernel file ./include/linux/bitmap.h
• bitmap overview(9)
• bitmap bitops(9)
• declare bitmap(9)
• bitmap_find_next_zero_area(9)
• bitmap_or_equal(9)
• bitmap_weight_from(9)
• bitmap_scatter(9)
• bitmap_gather(9)
• bitmap_release_region(9)
• bitmap_find_free_region(9)
• BITMAP_FROM_U64(9)
• bitmap_from_u64(9)
• bitmap_read(9)
• bitmap_write(9)

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🌈 SIGN-OFF 🌈

k bye bestie, go allocate responsibly 🧚 this cutie lives over in ./include/linux, dated October 2026, and yes the page is literally called bitmap_allocate_region(9) — remember her name 💖⭐