smp_mb__afte...cu_read_lock(9)

💖 smp_mb__afte...cu_read_lock(9) 💖

okay so bestie, welcome to the Kernel API Manual — yes that's the manual name, we stan a whole manual 🫶 — and today's main character is smp_mb__after_srcu_read_lock, a function so iconic it got its own page 💅

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✨ NAME ✨

smp_mb__after_srcu_read_lock — literally here to make sure everything is fully ordered after srcu_read_lock, no cap 🎀

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🌸 SYNOPSIS 🌸

void smp_mb__after_srcu_read_lock (void );

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🦋 ARGUMENTS 🦋

• void — no arguments. none. zero. it takes nothing. she's low maintenance like that 🙈

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🧚 DESCRIPTION 🧚

okay so picture this: you've got a preceding srcu_read_lock just sitting there, minding its business, being a one-way vibe. this function converts it into a two-way memory barrier 🔥 iconic behavior honestly.

call this after srcu_read_lock, and it guarantees that all memory operations that occur after smp_mb__after_srcu_read_lock will appear to happen after the preceding srcu_read_lock. like, ordering? established. the timeline? respected. 👑

ngl if you're doing memory ordering without this you're kind of just vibing in the dark 💀

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⭐ SEE ALSO ⭐

these are all the besties in the group chat — they live in the kernel file ./include/linux/srcu.h:

• get_completed_synchronize_srcu(9)
• same_state_synchronize_srcu(9)
• srcu_read_lock_held(9)
• srcu_dereference_check(9)
• srcu_dereference(9)
• srcu_dereference_notrace(9)
• srcu_read_lock(9)
• srcu_read_lock_fast(9)
• srcu_read_lock_fast_updown(9)
• srcu_down_read_fast(9)
• srcu_read_lock_nmisafe(9)
• srcu_down_read(9)
• srcu_read_unlock(9)
• srcu_read_unlock_fast(9)
• srcu_read_unlock_fast_updown(9)
• srcu_up_read_fast(9)
• srcu_read_unlock_nmisafe(9)
• srcu_up_read(9)
• smp_mb__after_srcu_read_unlock(9)

like. that's a whole squad. the srcu family ate and left no crumbs 🌈

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and that's the whole page, bestie!! sourced straight from ./include/linux, dated October 2026 — so like, future-iconic 🦋. keep your barriers two-way and your srcu reads ordered. mwah 💜🎀✨