flush_to_ldisc(9)

💅 flush_to_ldisc(9) — the Kernel API Manual moment 🎀

okay so bestie, we're in the Kernel API Manual and this page is literally about flush_to_ldisc. yes the name is giving exactly what it is. let's go 🦋

---

✨ NAME ✨

flush_to_ldisc — flush data from buffer to ldisc 💖

---

🌸 SYNOPSIS 🌸

void flush_to_ldisc (struct work_struct *work );

like, that's the whole signature. no cap. she's simple, she's iconic 👑

---

🎀 ARGUMENTS 🎀

• work — this is the tty structure passed from the work queue. yes queen, it's a struct work_struct * and it's carrying the tty vibes over from the work queue 🫶

---

💖 DESCRIPTION 💖

so here's the tea: this routine gets called out of the software interrupt to flush data from the buffer chain over to the line discipline. literally moving the data along, main character energy only ✨

the receive_buf method is single threaded for each tty instance. one at a time, no cutting in line, we respect the queue 💅

Locking: she takes the buffer lock to ensure the single-threaded flip buffer 'consumer' — iykyk, gotta protect that consumer, fr fr 🔥

---

🦋 SEE ALSO 🦋

kernel file ./drivers/tty/tty_buffer.c, plus the whole friend group of related calls:

• tty_buffer_lock_exclusive(9)
• tty_buffer_unlock_exclusive(9)
• tty_buffer_space_avail(9)
• tty_buffer_free_all(9)
• tty_buffer_alloc(9)
• tty_buffer_free(9)
• tty_buffer_flush(9)
• __tty_buffer_request_room(9)
• tty_prepare_flip_string(9)
• tty_ldisc_receive_buf(9)
• tty_flip_buffer_push(9)
• tty_insert_flip_string_and_push_buffer(9)
• tty_buffer_init(9)
• tty_buffer_set_limit(9)

they're all in ./drivers/tty together, one big happy tty family 🌈🧚

---

and that's the page bestie, go forth and flush responsibly 💜

written under ./drivers/tty, dated October 2026, and yeah it's flush_to_ldisc(9) — periodt. 💀🌸