srcu_dereference_check(9)

💅 srcu_dereference_check(9) 💅

okay so bestie, welcome to the Kernel API Manual entry for srcu_dereference_check(9) — the little function with main character energy that fetches an SRCU-protected pointer so you can dereference it later. No cap, this is the one. 💖

✨ NAME ✨

srcu_dereference_check — fetch SRCU-protected pointer for later dereferencing. Literally that. 🦋

💖 SYNOPSIS 💖

srcu_dereference_check (p , ssp , c );

🎀 ARGUMENTS 🎀

• p — the pointer to fetch and protect for later dereferencing. It's giving “hold this for me, bestie”. 🫶
• ssp — pointer to the srcu_struct, which is used to check that we really are in an SRCU read-side critical section. Lowkey the vibe check for your locking. 🔥
• c — condition to check for update-side use. Yes bestie, this is the condition. 💅

🌸 DESCRIPTION 🌸

If PROVE_RCU is enabled, invoking this outside of an RCU read-side critical section will result in an RCU-lockdep splat, unless c evaluates to 1. Not me getting yelled at by lockdep 😭. The c argument will normally be a logical expression containing lockdep_is_held calls. So like, that's the receipts. 🧚

🌈 SEE ALSO 🌈

The kernel file ./include/linux/srcu.h is where it lives, and these are the whole friend group — go say hi:

• get_completed_synchronize_srcu(9)
• same_state_synchronize_srcu(9)
• srcu_read_lock_held(9)
• srcu_dereference(9)
• srcu_dereference_notrace(9)
• srcu_read_lock(9)
• srcu_read_lock_fast(9)
• srcu_read_lock_fast_updown(9)
• srcu_down_read_fast(9)
• srcu_read_lock_nmisafe(9)
• srcu_down_read(9)
• srcu_read_unlock(9)
• srcu_read_unlock_fast(9)
• srcu_read_unlock_fast_updown(9)
• srcu_up_read_fast(9)
• srcu_read_unlock_nmisafe(9)
• srcu_up_read(9)
• smp_mb__after_srcu_read_unlock(9)
• smp_mb__after_srcu_read_lock(9)

okay bye bestie 💖 this page came from ./include/linux, dated October 2026, and it's serving srcu_dereference_check(9) realness. go dereference responsibly, periodt. 🎀