rcu_sync_is_idle(9)

💅 rcu_sync_is_idle(9) — the kernel API manual, bestie edition 🎀

okay so this one lives in the Kernel API Manual and it's genuinely so tiny but it matters, bestie, trust 💖

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✨ NAME ✨

rcu_sync_is_idle — literally just answering "are readers permitted to use their fastpaths?" 🦋

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✨ SYNOPSIS ✨

bool rcu_sync_is_idle (struct rcu_sync *rsp );

like yes that's the whole thing, she's little but she's iconic 💅

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✨ ARGUMENTS ✨

• rsp — pointer to the rcu_sync structure you're using for synchronization. that's your girl, pass her in 🫶

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✨ DESCRIPTION ✨

returns true if readers are permitted to use their fastpaths ✨

🚨 important, no cap: this must be invoked within some flavor of RCU read-side critical section. like, that's not optional, that's the vibe check. don't be calling this outside one, bestie 😭

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✨ SEE ALSO ✨

• Kernel file ./include/linux/rcu_sync.h — go read it, iykyk 📖🌈

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anyway that's the whole page, she's short and sweet and she ate 💀🌸

sign-off szn: this little gem comes to you from ./include/linux, dated October 2026 ⭐ and it's page rcu_sync_is_idle(9) of the Kernel API Manual, mwah 💜🧚