cond_synchr...pedited_full(9)

💅 cond_synchronize_rcu_expedited_full — Kernel API Manual ✨

okay bestie, buckle up, because this one is a whole RCU grace period situation and honestly it's giving "wait, but only if you have to" 🎀

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✨ NAME ✨

cond_synchronize_rcu_expedited_full — conditionally wait for an expedited RCU grace period 🦋

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🌸 SYNOPSIS 🌸

void cond_synchronize_rcu_expedited_full(struct rcu_gp_seq *gsp);

literally that's it. no cap. 🫶

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🎀 ARGUMENTS 🎀

• gsp — the state value you got from get_state_synchronize_rcu_full, start_poll_synchronize_rcu_full, or start_poll_synchronize_rcu_expedited_full. like, one of those three, bestie, don't just make one up 💅

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🔥 DESCRIPTION 🔥

so here's the vibe check 👑

If a full RCU grace period has already elapsed since that call to get_state_synchronize_rcu_full, start_poll_synchronize_rcu_full, or start_poll_synchronize_rcu_expedited_full — the very call that gave you gsp — then this function just... returns. nothing to see here, we're done, bye 💖

Otherwise? it invokes synchronize_rcu_expedited and actually waits for a full grace period. slay, but like, only when it has to. ⭐

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⚠️ not me forgetting counter wrap 😭 — Yes, this function does not take counter wrap into account. But counter wrap is harmless. If the counter wraps, we have waited for more than 2 billion grace periods (and way more on a 64-bit system!), so waiting for a couple of additional grace periods should be just fine. like honestly, at that point, who's counting 🙈

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🦋 the memory-ordering situation 🦋

This function provides the same memory-ordering guarantees that would be provided by a synchronize_rcu that was invoked at the call to the function that provided gsp and that returned at the end of this function. same energy, same guarantees, periodt ✨

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🌈 SEE ALSO 🌈

• Kernel file ./kernel/rcu/tree_exp.h — plus these iconic siblings:
• synchronize_rcu_expedited(9)
• start_poll_synchronize_rcu_expedited(9)
• start_poll_synchronize_rcu_expedited_full(9)
• cond_synchronize_rcu_expedited(9)

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okay that's the whole page bestie, you ate that 💅✨

source: ./kernel/rcu 🌸 date: October 2026 🎀 and yes the title is still cond_synchr...pedited_full(9) because some things never change 😭🫶 go forth and wait conditionally, queen 👑