srcu_up_read_fast(9)

📦 version 7.3.1, in nixpkgs unstable

✨ srcu_up_read_fast(9) ✨

okay so bestie, we're in the Kernel API Manual, section 9, and today's main character is srcu_up_read_fast(9). yes it's a mouthful. no you can't skip it. let's go 💅

🎀 NAME 🎀

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

(yes, "a old reader". that's what the page says. we don't edit the lore, we just report it 🫶)

🦋 SYNOPSIS 🦋

void srcu_up_read_fast (struct srcu_struct *ssp , struct srcu_ctr
__percpu *scp );

literally just two args, look at her go ✨

🌸 ARGUMENTS 🌸

  • ssp — the srcu_struct where you're gonna unregister the old reader. this is the house. the venue. the whole vibe check location 🏠
  • scp — the return value from the corresponding srcu_read_lock_fast. you gotta bring your ticket back to get your stuff, iykyk 🎟️

💖 DESCRIPTION 💖

so what she does is: exit an SRCU read-side critical section — but not necessarily from the same context as the matching srcu_down_read_fast.

read that again. not necessarily the same context. it's giving "you can clock out from a completely different room than the one you clocked into" and honestly? iconic. that's the whole point of the _up_ flavor, bestie. the flexibility IS the function 🔥

no cap though — because this one isn't tied to the same context, it's doing more work under the hood than your basic unlock. respect the machinery. 🧚

🌈 SEE ALSO 🌈

this list is LONG and we're gonna say every single name because we're not cowards:

Kernel file ./include/linux/srcu.h:

that's nineteen references. nineteen!! the SRCU cinematic universe is real and it is EXPANSIVE 👑

okay that's the whole page, love u, go touch some include/linux/srcu.h 💜

source path: ./include/linux · date: October 2026 · and yes, the page signs off as srcu_up_read_fast(9) because she's self-titled like that 🎀✨

📦 where this page comes from