read_seqbeg...lock_irqsave(9)

💖 NAME 💖

okay so this is the Kernel API Manual entry for read_seqbegin_or_lock_irqsave (a.k.a. read_seqbeg...lock_irqsave(9)), and it is literally: begin a seqlock_t lockless reader, or a non-interruptible locking reader. 💅✨

---

✨ SYNOPSIS ✨

unsigned long read_seqbegin_or_lock_irqsave (seqlock_t *lock , int *seq
);

---

🎀 ARGUMENTS 🎀

• lock — Pointer to seqlock_t. 🫶
• seq — Marker and return parameter. Check read_seqbegin_or_lock. 👀

---

🦋 DESCRIPTION 🦋

bestie, this is the _irqsave variant of read_seqbegin_or_lock. Use it only if the seqlock_t write section, or other read sections, can be invoked from hardirq context. 😤 no cap, that condition is doing main character energy.

the numbered lore is:

1. The saved local interrupts state in case of a locking reader, to be passed to done_seqretry_irqrestore.
2. The encountered sequence counter value, returned through seq overloaded as a return parameter. Check read_seqbegin_or_lock.

---

⚠️ NOTE ⚠️

Interrupts will be disabled only for "locking reader" mode. 💀 that part matters, bestie.

---

👀 SEE ALSO 👀

Kernel file ./include/linux/seqlock.h — plus the whole iconic 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_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)
• done_seqretry_irqrestore(9)
• scoped_seqlock_read(9)

---

xoxo, your kernel bestie 💖 — source/version: ./include/linux; date: October 2026; page: read_seqbeg...lock_irqsave(9). mwah! 🎀