rcu_dereference_all_check(9)

📦 version 7.3.1, in nixpkgs unstable

okay bestie, welcome to rcu_dereference_all_check(9) from the Kernel API Manual — we're doing RCU debug-checking together and it's literally gonna slay ✨🦋

🌸 NAME 🌸

rcu_dereference_all_check — it's rcu_dereference_all with debug checking 💅

✨ SYNOPSIS ✨

rcu_dereference_all_check (p , c );

🎀 ARGUMENTS 🎀

  • p — the pointer to read, prior to dereferencing it 👀 read first, dereference later, bestie
  • c — the conditions under which the dereference will take place ✅ it's the vibe check for when the dereference can happen

💖 DESCRIPTION 💖

so this one is similar to rcu_dereference_check, but it allows protection by all forms of vanilla RCU readers — including preemption-disabled, bh-disabled, and interrupt-disabled regions of code 🫶

quick vocab moment: “vanilla RCU” does not include SRCU or the various Tasks RCU flavors. periodt 💅

🚨 important bestie warning: this macro should not be backported to any Linux-kernel version preceding v5.0 because of changes in synchronize_rcu semantics prior to that version. like, do not do it, fr fr 😭

🦋 SEE ALSO 🦋

Kernel file ./include/linux/rcupdate.h is right here in the group chat 🏠

okay that's the page, bestie — source/version ./include/linux, date October 2026, page rcu_dereference_all_check(9) 💅✨

📦 where this page comes from