in_range(9)

✨ NAME ✨

okay so bestie, welcome to in_range from the Kernel API Manual — this page is literally about determining if a value lies within a range. 💅

🌸 SYNOPSIS 🌸

in_range (val , start , len );

🎀 ARGUMENTS 🎀

• val — the value you’re testing. 👀
• start — the first value in the range.
• len — how many values are in the range.

💖 DESCRIPTION 💖

This is more efficient than "if (start <= val && val < (start + len))". No cap. ✨

It also gives a different answer if start + len overflows the size of the type by a sufficient amount to encompass val. So yeah, decide for yourself which behavior you want, or prove that start + len never overflows. 🫶

Do not blindly replace one form with the other. fr fr, that’s the whole warning. 😭

🔥 SEE ALSO 🔥

Kernel file ./include/linux/minmax.h: min(9), max(9), umin(9), umax(9), min3(9), max3(9), min_t(9), max_t(9), min_not_zero(9), clamp(9), clamp_t(9), clamp_val(9), min_array(9), max_array(9), swap(9).

made with 💖 from ./include/linux · October 2026 · in_range(9) 👑