write_seqcount_begin_nested(9)

okay so bestie, welcome to write_seqcount_begin_nested(9) from the Kernel API Manual ✨ — this is the page where we start a seqcount_t write section with a custom lockdep nesting level, and I'm gonna walk you through it like we're gossiping in the group chat 💅.

🌸 NAME 🌸

write_seqcount_begin_nested — start a seqcount_t write section with custom lockdep nesting level. That's the whole vibe: you're opening a write section, and the nesting level for lockdep is custom, periodt 🎀.

🦋 SYNOPSIS 🦋

write_seqcount_begin_nested (s , subclass );

literally that's the call shape — keep it exact, bestie 💖.

🎀 ARGUMENTS 🎀

• s — Pointer to seqcount_t or any of the seqcount_LOCKNAME_t variants. So it's the seqcount thing you're opening the write section on, iykyk.
• subclass — the lockdep nesting level. That's your custom nesting-level flex 🫶.

💖 DESCRIPTION 💖

For the full lore, see Documentation/locking/lockdep-design.rst — that's the doc bestie to consult. No cap 🌟.

💀 CONTEXT 💀

Context check: go check write_seqcount_begin. That's the context rule, bestie — don't skip the vibe check 💅.

🌈 SEE ALSO 🌈

Kernel file: ./include/linux/seqlock.h — that's where this whole friend group lives 🏡✨.

• 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(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), need_seqretry(9), done_seqretry(9)
• read_seqbegin_or_lock_irqsave(9), done_seqretry_irqrestore(9), scoped_seqlock_read(9)

cute little sign-off: this page is from the source/version line ./include/linux, dated October 2026, and it's literally write_seqcount_begin_nested(9). mwah 💋✨