srcu_read_unlock_nmisafe(9)

💅 srcu_read_unlock_nmisafe — bestie's guide to leaving the SRCU party (NMI edition) 🎀

okay so this is srcu_read_unlock_nmisafe(9), from the Kernel API Manual (section 9, kernel devs only, sorry babe), and it's literally the "ok I'm done, let me out" move for SRCU readers. ✨

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✨ NAME ✨

srcu_read_unlock_nmisafe — unregister a old reader from an SRCU-protected structure.

(and yes, the original says "a old reader" — I'm not fixing it, that's the canon, we respect the lore 🫶)

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🌸 SYNOPSIS 🌸

void srcu_read_unlock_nmisafe (struct srcu_struct *ssp , int idx );

like, that's the whole vibe check right there. returns void, takes two things, done. 💅

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🦋 ARGUMENTS 🦋

• ssp — the srcu_struct in which to unregister the old reader. this is the guest list you're removing your name from, bestie 🎟️
• idx — the return value from the corresponding srcu_read_lock_nmisafe. you gotta hand back the exact little token they gave you when you walked in — no swapping, no losing it, that's the whole point 🙈

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💖 DESCRIPTION 💖

Exit an SRCU read-side critical section, but in an NMI-safe manner. 🔥

that's it, that's the tea. you're leaving the read-side critical section, and you're doing it the NMI-safe way, which is the whole entire reason this function exists separately from the normie srcu_read_unlock(9). main character energy, non-maskable-interrupt-proof edition 👑 no cap.

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⭐ SEE ALSO ⭐

• the kernel file ./include/linux/srcu.h — that's where the source lives, go read it iykyk 📖
• get_completed_synchronize_srcu(9)
• same_state_synchronize_srcu(9)
• srcu_read_lock_held(9)
• srcu_dereference_check(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_up_read(9)
• smp_mb__after_srcu_read_unlock(9)
• smp_mb__after_srcu_read_lock(9)

like, the whole SRCU friend group is in here — go say hi to all of them, they're all icons 🧚💜

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that's a wrap, bestie! 🌈 this page came straight out of the ./include/linux corner of the kernel, dated October 2026, and it's filed under Kernel API Manual section 9. slay, stay NMI-safe, and always return your idx 🍓💀✨