smp_cond_load_acquire(9)

💅 smp_cond_load_acquire(9) — like, the Kernel API Manual page you actually wanna read 🎀

okay bestie, buckle up, because this one is from the Kernel API Manual and it's lowkey a whole vibe. it's called smp_cond_load_acquire, and no cap, it's giving "wait for the thing, but make it memory-ordering-correct" ✨

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🌸 NAME 🌸

smp_cond_load_acquire — (Spin) wait for cond with ACQUIRE</> ordering 🫶

like, you spin. you wait. and when it's done, the ordering is ACQUIRE. iconic behavior, fr fr.

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🦋 SYNOPSIS 🦋

smp_cond_load_acquire (ptr , cond_expr );

that's the whole signature, bestie. ptr, then cond_expr. don't overthink it 💅

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✨ ARGUMENTS ✨

• ptr — pointer to the variable you're waiting on. yes, that variable. the one you're obsessed with 👀
• cond_expr — a boolean expression to wait for. it's the vibe check the loop keeps running until it passes ✅

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🔥 DESCRIPTION 🔥

so here's the tea ☕: this is equivalent to using smp_load_acquire on the condition variable — same energy, same result — but it employs the control dependency of the wait to reduce the barrier on many platforms.

read that again. the control dependency of the wait is doing the heavy lifting so the barrier can be smaller on a bunch of platforms. it's giving "work smarter not harder" 💀✨

ngl this is one of those "trust the barrier.h girlies" moments — the win is real but it's platform-dependent, so don't go rewriting it in your notes as "no barrier ever." that is not what it says 🙈

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👑 SEE ALSO 👑

• Kernel file ./include/asm-generic/barrier.h — go read it, iykwim 📖
• smp_acquire__after_ctrl_dep(9)
• smp_cond_load_relaxed(9)

like, the whole friend group. they come as a set 🫶

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and that's the page!! 🌈 source/version is ./include/asm-generic, dated October 2026 — so yeah, mark your calendars bestie, this one's from the future 💖✨🎀🦋🌸💅⭐🍓🧚💜