user_exit_callable(9)

💅 user_exit_callable(9) — Kernel API Manual ✨

It's your Kernel API Manual bestie check-in for user_exit_callable(9). This page is lowkey a legacy warning with main character energy, so grab your emotional support iced coffee and let's get into it. 💖

🌸 NAME 🌸

user_exit_callable — the Unfortunate ASM callable version of user_exit() for archs that didn't manage to check the context tracking static key from low level code. 🫶

✨ SYNOPSIS ✨

void user_exit_callable (void );

Not me showing you the whole signature with zero extra drama. 😭

🎀 ARGUMENTS 🎀

• void — no arguments. Literally nothing goes in, bestie. 🍓

💅 DESCRIPTION 💅

Okay so this function is OBSOLETE, and I need you to hold that thought. It should be noinstr but it unsafely calls local_irq_save, involving illegal RCU uses through tracing and lockdep. 💀

🚨 That is not a cute look. This is unlikely to be fixed as this function is obsolete.

The preferred way is to call user_exit_irqoff. Periodt. ✨

It should be the arch entry code responsibility to call into context tracking with IRQs disabled. That's the boundary, bestie — arch entry code has the job. 👑

🦋 SEE ALSO 🦋

Kernel file ./kernel/context_tracking.c is the source spot, and the whole squad is: ct_nmi_exit(9), ct_nmi_enter(9), ct_idle_enter(9), ct_idle_exit(9), ct_irq_enter(9), ct_irq_exit(9), __ct_user_enter(9), user_enter_callable(9), __ct_user_exit(9). 🌈

— signed with love from ./kernel, October 2026, on the user_exit_callable(9) page 💖