debugfs_create_u32(9)

📦 version 7.3.1, in nixpkgs unstable

💅 debugfs_create_u32 💅

okay so bestie, welcome to the Kernel API Manual entry for debugfs_create_u32 — yes that's the whole title, we're being formal today. this one's short and sweet and honestly kind of iconic: it's the function that makes you a debugfs file for reading and writing an unsigned 32-bit value. slay. 🎀

✨ NAME ✨

debugfs_create_u32 — create a debugfs file that is used to read and write an unsigned 32-bit value. that's it, that's the vibe. 💖

🦋 SYNOPSIS 🦋

void debugfs_create_u32 (const char *name , umode_t mode , struct dentry
*parent , u32 *value );

literally copy it exactly like that, no cap. the line break is in there and i'm not touching it, that's just how the page is. 📝

🌸 ARGUMENTS 🌸

  • name — a pointer to a string containing the name of the file to create. so like, what you want your file to be called. main character naming energy. 👑
  • mode — the permission that the file should have. this one decides whether people can actually read from it and write to it, so think before you set it fr fr. 🔐
  • 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. so NULL = home base, no questions. 🏠
  • value — a pointer to the variable that the file should read to and write from. yes, the actual live variable. the file is basically a little window into it, iykyk. 🪟

💜 DESCRIPTION 💜

okay so here's the whole deal. this function creates a file in debugfs with the given name that contains the value of the variable value. 🫶

and if the mode variable is so set, it can be read from, and written to. that's the entire description. short, sweet, ate and left no crumbs. 💅

just a heads up, bestie: the read/write goodness is gated on mode — that part is conditional, so don't come for me if you set a weird mode and nothing happens. 🫠

🔥 SEE ALSO 🔥

Kernel file ./fs/debugfs/file.c — plus this whole little friend group of related functions:

like a whole squad of debugfs creators. u32 is just the one who peaked in the group chat. 🌈

and that's the page!! this absolute gem comes from ./fs/debugfs in the Kernel API Manual, dated October 2026 — same name top and bottom, debugfs_create_u32(9), all cute and symmetrical. go read and write some unsigned 32-bit values, bestie, you've got this 🍓✨💖

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