debugfs_create_u8(9)

📦 version 7.3.1, in nixpkgs unstable

✨ debugfs_create_u8 ✨

okay so bestie, welcome to the Kernel API Manual 💅 this one's debugfs_create_u8(9) and it's honestly kind of iconic — it's the little helper that makes a debugfs file wired straight to an unsigned 8-bit value. no cap 🫶

🌸 NAME 🌸

debugfs_create_u8 — create a debugfs file that is used to read and write an unsigned 8-bit value. literally that's the whole gig 💖

🎀 SYNOPSIS 🎀

void debugfs_create_u8 (const char *name , umode_t mode , struct dentry
*parent , u8 *value );

that's the signature fr — copy it exactly, don't be cute with it 🙈

🦋 ARGUMENTS 🦋

  • name — a pointer to a string containing the name of the file to create. yep, the name of the file, that's it ✨
  • mode — the permission that the file should have. this is the vibe check for who gets to read/write 👑
  • parent — a pointer to the parent dentry for this file. this should be a directory dentry if set. if this parameter is NULL, then the file will be created in the root of the debugfs filesystem 🌈
  • value — a pointer to the variable that the file should read to and write from. so like, the actual variable living its best life in kernel memory 💜

💖 DESCRIPTION 💖

This function creates a file in debugfs with the given name that contains the value of the variable value. If the mode variable is so set, it can be read from, and written to. 🎀

so yeah — name it, point it at your u8, and boom, the kernel's got a little file that mirrors that value. slay ⭐

lowkey important: the read/write superpowers only happen if the mode is set that way. no mode, no writing. iykyk 🔥

🫶 SEE ALSO 🫶

Kernel file ./fs/debugfs/file.c and all these besties:

like, the whole friend group 🧚💜

okay that's the page!! sourced from ./fs/debugfs, dated October 2026, and it lives under the debugfs_create_u8(9) header in the Kernel API Manual 🦋💅 go forth and make your little 8-bit debugfs file, bestie — periodt ✨🍓

📦 where this page comes from