write_sequnlock(9)

💖 write_sequnlock (9) 💖

okay so welcome to the Kernel API Manual, bestie — this page is literally all about write_sequnlock, and it's giving kernel-locking main character energy 💅✨.

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💅 NAME 💅

write_sequnlock — end a seqlock_t write side critical section. periodt.

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✨ SYNOPSIS ✨

void write_sequnlock (seqlock_t *sl );

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🎀 ARGUMENTS 🎀

• sl — pointer to seqlock_t. yes, a pointer, not the whole struct — slay 🫶

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🦋 DESCRIPTION 🦋

So write_sequnlock closes the write side critical section of the given seqlock_t. That write side is serialized and non-preemptible, no cap — it's right there in the descriptor, and it matters 😌.

It's the unlock-side closer for that write section. The synopsis says void, so there's literally no return value to catch. iconic.

bestie reminder: keep the vibe check on the details — this is about closing the write side critical section, and that section is explicitly serialized and non-preemptible 💖

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🌈 SEE ALSO 🌈

Kernel file ./include/linux/seqlock.h, plus the whole squad: seqcount_init(9), SEQCNT_ZERO(9), __read_seqcount_begin(9), raw_read_seqcount_begin(9), read_seqcount_begin(9), raw_read_seqcount(9), raw_seqcount_try_begin(9), raw_seqcount_begin(9), __read_seqcount_retry(9), read_seqcount_retry(9), raw_write_seqcount_begin(9), raw_write_seqcount_end(9), write_seqcount_begin_nested(9), write_seqcount_begin(9), write_seqcount_end(9), raw_write_seqcount_barrier(9), write_seqcount_invalidate(9), SEQCNT_LATCH_ZERO(9), seqcount_latch_init(9), raw_read_seqcount_latch(9), read_seqcount_latch(9), raw_read_seqcount_latch_retry(9), read_seqcount_latch_retry(9), raw_write_seqcount_latch(9), write_seqcount_latch_begin(9), write_seqcount_latch(9), write_seqcount_latch_end(9), seqlock_init(9), DEFINE_SEQLOCK(9), read_seqbegin(9), read_seqretry(9), write_seqlock(9), write_seqlock_bh(9), write_sequnlock_bh(9), write_seqlock_irq(9), write_sequnlock_irq(9), write_seqlock_irqsave(9), write_sequnlock_irqrestore(9), read_seqlock_excl(9), read_sequnlock_excl(9), read_seqlock_excl_bh(9), read_sequnlock_excl_bh(9), read_seqlock_excl_irq(9), read_sequnlock_excl_irq(9), read_seqlock_excl_irqsave(9), read_sequnlock_excl_irqrestore(9), read_seqbegin_or_lock(9), need_seqretry(9), done_seqretry(9), read_seqbegin_or_lock_irqsave(9), done_seqretry_irqrestore(9), scoped_seqlock_read(9). iykyk 💜

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mwah 💋 — source/version: ./include/linux, dated October 2026. xoxo, your local kernel-locking bestie 🫶🌸