debug_register_mode(9)

📦 version 7.3.1, in nixpkgs unstable

💅 debug_register_mode(9) 💅

okay so this is from the Kernel API Manual, bestie — sit down, we're learning debug_register_mode today and honestly? it's giving main character energy in ./arch/s390/kernel/debug.c.

✨ NAME ✨

debug_register_mode — creates and initializes debug area. that's it, that's the vibe 🎀

🌸 SYNOPSIS 🌸

debug_info_t * debug_register_mode (const char *name , int
       pages_per_area , int nr_areas , int buf_size , umode_t mode , uid_t uid
       , gid_t gid );

like yes she takes seven arguments, she's high maintenance, we love her for it 💅

🦋 ARGUMENTS 🦋

  • name — Name of debug log (e.g. used for debugfs entry). literally the name tag of the debug party 🏷️
  • pages_per_area — Number of pages, which will be allocated per area. how many pages each area gets, no cap 📄
  • nr_areas — Number of debug areas. how many areas we're doing. quantity, periodt ✨
  • buf_size — Size of data area in each debug entry. the size of the data part of every entry 🍓
  • mode — File mode for debugfs files. E.g. S_IRWXUGO. the permissions, iykyk 🔐
  • uid — User ID for debugfs files. Currently only 0 is supported. ⚠️ yeah bestie, only 0, don't try to be creative
  • gid — Group ID for debugfs files. Currently only 0 is supported. same deal, only 0 🙈

👑 RETURN 👑

  • Handle for generated debug area — slay, you got your handle 💖
  • NULL if register failed — the sad path 😭

🔥 DESCRIPTION 🔥

Allocates memory for a debug log.

🚨 big warning bestie: Must not be called within an interrupt handler. like. do not. that's the one rule.

🌈 SEE ALSO 🌈

Kernel file ./arch/s390/kernel/debug.c — go read her, she's iconic:

that's the whole page, no notes 🫶

sign-off time: this lil gem lives in ./arch/s390/kernel, stamped October 2026, and it's brought to you by debug_register_mode(9) — go forth and register your debug areas responsibly, mwah 💜🧚‍♀️⭐

📦 where this page comes from