same_state_...ize_rcu_full(9)

💅 same_state_synchronize_rcu_full(9) — a Kernel API Manual moment

okay so bestie, this page lives in the Kernel API Manual, and it's genuinely one of the shorter ones — a little baby function with a whole lot of personality. let's get into it ✨

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🌸 NAME

same_state_synchronize_rcu_full — are two old-state values, like, identical? are they the same girl? 💅

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🎀 SYNOPSIS

bool same_state_synchronize_rcu_full (struct rcu_gp_seq *rgosp1 , struct
       rcu_gp_seq *rgosp2 );

it hands you back a bool, bestie. true or false, that's the whole vibe check 🔥

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🦋 ARGUMENTS

• rgosp1 — the first old-state value. the one you're holding up next to the other one 🫶
• rgosp2 — the second old-state value. the other half of the comparison, no cap 💖

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✨ DESCRIPTION

okay so listen. the two old-state values you're passing in must have come from one of these three places, periodt:

• get_state_synchronize_rcu_full
• start_poll_synchronize_rcu_full
• get_completed_synchronize_rcu_full

like, that's the whole sourcing requirement, don't be out here making up your own old-state values 🙈

so what does it do? it returns true if the two values are identical, and false otherwise. that's it. that's the function. iconic behaviour honestly 👑

and why do you care? because this lets structures whose lifetimes are tracked by old-state values push those values up to a list header — which means those structures can be slightly smaller. little size win, big main-character energy. we love a memory optimization 🌈

⚠️ important vibe check, do not skip this one: equality here is judged on a bitwise basis. so an rcu_gp_seq structure with an already-completed state in one field will compare not-equal to a structure with an already-completed state in the other field. like, yes, they're both "completed," but bitwise be like that sometimes 😭

and honestly, as the page itself points out — after all, the rcu_gp_seq structure is opaque, so how did such a situation come to pass in the first place? 💀 that's the real question. no notes. flawless. keep that in mind fr fr 🍓

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🔥 SEE ALSO

• Kernel file ./include/linux/rcutree.h — go read it, iykyk 🧚

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💜 a lil sign-off, bestie

that's the whole page! it came from ./include/linux and it's dated October 2026 — so mark your calendar, screenshot it, send it to the group chat, whatever feels right. you understood it, you slayed it, periodt. 🎀✨🌸