bitmap_from_arr64(9)

💅 bitmap_from_arr64 — Kernel API Manual, bestie edition ✨

okay so picture this: you've got a big ol' array of u64 bits and you need it to become a bitmap. that's it. that's the whole thing. this function is literally the glow-up pipeline for your bits, and she does not miss. 🎀

---

✨ NAME ✨

bitmap_from_arr64 — copy the contents of u64 array of bits to bitmap, no cap 🫶

---

🌸 SYNOPSIS 🌸

void bitmap_from_arr64 (unsigned long *bitmap , const u64 *buf ,
       unsigned int nbits );

three little params, one iconic little job. let's meet them 👑

---

💖 ARGUMENTS 💖

• bitmap — array of unsigned longs, the destination bitmap. she's the one getting the makeover, bestie 💅
• buf — array of u64 (in host byte order), the source bitmap. the original queen, being copied from ✨
• nbits — number of bits in bitmap. yes she's counting, and yes it matters 🧚

---

🦋 SEE ALSO 🦋

okay so the whole friend group showed up, and honestly? obsessed. go read these too:

• Kernel file ./lib/bitmap.c
• bitmap introduction(9)
• __bitmap_shift_right(9)
• __bitmap_shift_left(9)
• bitmap_cut(9)
• bitmap_find_next_zero_area_off(9)
• bitmap_pos_to_ord(9)
• bitmap_remap(9)
• bitmap_bitremap(9)
• bitmap_onto(9)
• bitmap_fold(9)
• bitmap_from_arr32(9)
• bitmap_to_arr32(9)
• bitmap_to_arr64(9)

---

lowkey the entire ./lib directory is main character energy and this function is just one verse in the group chat 🫶

anyway that's the page, love u, go copy some bits responsibly 💜

— from ./lib, dated October 2026, still bitmap_from_arr64(9) in the header to this very day ⭐🌈💀