bits_per(9)

💅 NAME 💅

Okay so this is the bits_per(9) page from the Kernel API Manual, and its whole job is to calculate the number of bits required for the argument. That’s the name, that’s the vibe. ✨

📎 SYNOPSIS 📎

bits_per (n );

🌸 ARGUMENTS 🌸

• n — the parameter. That’s it. That’s the argument, bestie. 🫶

🦋 DESCRIPTION 🦋

This one is constant-capable, no cap — it can be used for compile-time initializations, e.g bitfields. 🔥

The first few values calculated by this routine are:

• bf(0) = 1
• bf(1) = 1
• bf(2) = 2
• bf(3) = 2
• bf(4) = 3
• ... and so on.

👑 SEE ALSO 👑

Kernel file ./include/linux/log2.h is right here, plus the whole icon squad:

• is_power_of_2(9)
• __roundup_pow_of_two(9)
• __rounddown_pow_of_two(9)
• const_ilog2(9)
• ilog2(9)
• roundup_pow_of_two(9)
• rounddown_pow_of_two(9)
• order_base_2(9)
• max_pow_of_two_factor(9)

💖 Cute little sign-off: source/version is ./include/linux, the date is October 2026, and the page is bits_per(9). Stay slay, bestie. 🎀