mux_poll(9)

✨ mux_poll(9) — from the Kernel API Manual, bestie ✨

okay so this one is literally a tiny little timer callback that keeps the Serial MUX fed, and honestly it ate. let's get into it 🫶

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🌸 NAME 🌸

mux_poll — the Mux poll function. that's it, that's the whole name. short, sweet, iconic. 👑

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🎀 SYNOPSIS 🎀

void mux_poll (struct timer_list *unused );

one function, one pointer, zero drama (well… almost zero — see the next section 😭).

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🦋 ARGUMENTS 🦋

• unused — the unused variable 💀. yeah. it's literally named unused because it doesn't get used. the kernel is nothing if not honest about its situationships.

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💖 DESCRIPTION 💖

so here's the vibe: this function periodically polls the Serial MUX to check whether there's any new data chilling in there. that's the whole job. it wakes up on a timer, does a little vibe check on the serial mux, and dips. lowkey main character energy for such a small function ngl ✨

no cap, that's genuinely all it does — periodic polling, Serial MUX, new data. periodt.

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🔥 SEE ALSO 🔥

the whole fam lives in the Kernel file ./drivers/tty/serial/mux.c, and they're all starring in this episode together:

• get_mux_port_count(9)
• mux_tx_empty(9)
• mux_set_mctrl(9)
• mux_get_mctrl(9)
• mux_stop_tx(9)
• mux_start_tx(9)
• mux_stop_rx(9)
• mux_break_ctl(9)
• mux_write(9)
• mux_read(9)
• mux_startup(9)
• mux_shutdown(9)
• mux_set_termios(9)
• mux_type(9)
• mux_release_port(9)
• mux_request_port(9)
• mux_config_port(9)
• mux_verify_port(9)
• mux_probe(9)
• mux_init(9)
• mux_exit(9)

like, the entire friend group. go read them too, iykyk 💅

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that's the whole page bestie — no hidden flags, no secrets, no lore drops. sometimes a manpage is just a manpage 🌈

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alright, sign-off time 🎀 this icon was living in ./drivers/tty/serial, dated October 2026, and it ate every time. mwah 💜