range_end_overflows(9)

📦 version 7.3.1, in nixpkgs unstable

💅 range_end_overflows(9) — the kernel API manual, bestie edition ✨

Okay so we're in the kernel API manual today and the star of the show is range_end_overflows(9). Yes it's a mouthful, yes it's iconic, no we're not skipping it. Let's get into it 🎀

✨ NAME ✨

range_end_overflows — literally just checks if a range's endpoint is out of bounds. That's it. That's the whole gig 🫶

🌸 SYNOPSIS 🌸

range_end_overflows (start , size , max );

Look at her. Three little args. No cap, she's doing the most with the least 💅

🦋 ARGUMENTS 🦋

  • start — where the range starts, bestie. The beginning. The origin story ✨
  • size — how big the range is. How much we're working with 🎀
  • max — the exclusive upper boundary. Not inclusive, exclusive — she's got boundaries and she's sticking to them 👑

💖 DESCRIPTION 💖

So here's the tea: this function checks only if the endpoint of a range (start + size) exceeds max. Just the endpoint. Not the whole situation. Not the vibes. The endpoint 🔥

And here's the part where she's different from her sibling, okay? Unlike range_overflows, a zero-sized range at the boundary (i.e. start == max) is not considered an overflow. Not even a little. She's like "that's fine actually, that's valid 🧚"

Which makes her super useful for iterator-style checks — you know, that whole checking-as-you-go lifestyle. iykyk ⭐

🌈 RETURN 🌈

Returns true if the endpoint exceeds the boundary. That's the whole return. Very "yes or no, no in-between" of her 💀

👑 SEE ALSO 👑

Kernel file <pink>./include/linux/overflow.h</pink> — and honestly the whole overflow friend group, they all show up together:

Yeah that's the whole squad. Go read literally all of them, they all ate 🍓

Reminder bestie: max is exclusive, and starting at max with size of zero is fine. Don't be out here calling that an overflow, that's not the assignment 🙈

Okay that's the page!! This one lives in ./include/linux and the version/date on the door says October 2026, and yes her full name tag still reads range_end_overflows(9). Mwah, go forth and check those endpoints 💜✨

📦 where this page comes from