need_seqretry(9)

💅 need_seqretry(9) — Kernel API Manual 💅

okay so bestie, this is the whole need_seqretry moment from the Kernel API Manual, and it is literally all about checking whether your seqlock_t read section needs a retry. no cap. 🫶

✨ NAME ✨

need_seqretry — validate a seqlock_t "locking or lockless" read section 💖

🌸 SYNOPSIS 🌸

int need_seqretry (seqlock_t *lock , int seq );

🎀 ARGUMENTS 🎀

• lock — pointer to a seqlock_t 🦋
• seq — the sequence count, straight from read_seqbegin_or_lock ⭐

🔥 RETURN 🔥

true if a read section retry is required, false otherwise. periodt. 💅

👑 SEE ALSO 👑

okay so this is the full squad, all from the Kernel file ./include/linux/seqlock.h — not me leaving anyone out, bestie, every single one is here:

• 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_sequnlock(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)
• done_seqretry(9)
• read_seqbegin_or_lock_irqsave(9)
• done_seqretry_irqrestore(9)
• scoped_seqlock_read(9)

mwah 💋 that’s the page — source/version: ./include/linux, date: October 2026. stay iconic, bestie 🧚💜