rcu_unexpedite_gp(9)

🎀 NAME

okay so bestie, welcome to rcu_unexpedite_gp(9) from the Kernel API Manual 💅✨ This page is literally the undo button energy for an RCU expedite request, and it's giving very specific.

rcu_unexpedite_gp — Cancel prior rcu_expedite_gp() invocation 🫶

🌸 SYNOPSIS

void rcu_unexpedite_gp (void );

🦋 ARGUMENTS

• void — no arguments, periodt. Nothing to pass in, nothing to overthink, just vibes 😌.

✨ DESCRIPTION

Undo a prior call to rcu_expedite_gp. No cap, that's the whole assignment.

Here's the important condition, bestie: if all prior calls to rcu_expedite_gp are undone by a subsequent call to rcu_unexpedite_gp, and if the rcu_expedited sysfs/boot parameter is not set, then all subsequent calls to synchronize_rcu and friends will return to their normal non-expedited behavior 🔥

So yeah — when the expedite requests are fully cancelled and that parameter isn't set, the synchronize_rcu crew goes back to its normal non-expedited era. iconic behavior, honestly 👑

🔥 SEE ALSO

Kernel file ./kernel/rcu/update.c, plus these besties:

• rcu_read_lock_held_common(9)
• rcu_async_hurry(9)
• rcu_async_relax(9)
• rcu_expedite_gp(9)
• rcu_read_lock_held(9)
• rcu_read_lock_bh_held(9)
• wakeme_after_rcu(9)
• init_rcu_head_on_stack(9)
• destroy_rcu_head_on_stack(9)
• get_completed_synchronize_rcu(9)

Signed with love from ./kernel/rcu 🌈 — October 2026, rcu_unexpedite_gp(9) out! 💅✨