DECLARE BITMAP(9)

✨ declare bitmap(9) ✨

okay so bestie, this page is from the Kernel API Manual, section 9, and it is literally a one-macro moment. No cap: the whole page is the iconic declaration plus a SEE ALSO friend group 🫶.

🌸 NAME 🌸

declare bitmap — the DECLARE_BITMAP(name,bits) macro, living its best life in linux/types.h 💅.

🫶 DESCRIPTION 🫶

The DECLARE_BITMAP(name,bits) macro, in linux/types.h, can be used to declare an array named name of just enough unsigned long entries to contain all bit positions from 0 to bits - 1. That's the whole thing, and it's giving "exactly enough storage, no extra crumbs" ✨.

🦋 SEE ALSO 🦋

the whole see-also squad, in order:

• Kernel file ./include/linux/bitmap.h
• bitmap overview(9)
• bitmap bitops(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_allocate_region(9)
• bitmap_find_free_region(9)
• BITMAP_FROM_U64(9)
• bitmap_from_u64(9)
• bitmap_read(9)
• bitmap_write(9)

okay bye bestie — sourced from ./include/linux, dated October 2026, and filed under declare bitmap(9) in the Kernel API Manual 🫶✨