wdt_notify_sys(9)

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

okay so you're looking at a kernel API manual page, bestie, and it's for wdt_notify_sys — it lives in the Kernel API Manual and the whole page is right here, served fresh 🎀

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✨ NAME ✨

wdt_notify_sys -

fr fr the original page just leaves the description after the dash completely blank 😭 so that's what we're working with. No cap, nothing to add — moving on 💅

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🌸 SYNOPSIS 🌸

int wdt_notify_sys (struct notifier_block *this , unsigned long code ,
void *unused );

the way it's int, and the way it takes three things — that's the whole vibe check 🦋

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🎀 ARGUMENTS 🎀

• this — our notifier block, it's literally us, main character energy 👑
• code — the event being reported, i.e. what is going down
• unused — unused. that's it. that's the description. iconic honestly 🙈

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💖 DESCRIPTION 💖

so our notifier gets called on system shutdowns — that's its moment ✨

and the goal? we want to turn the card off at reboot. why, you ask? because otherwise the machine will reboot again during memory test, or — worse yet — during the following fsck 💀

this would suck. in fact, trust me — if it happens, it does suck. no notes, just facts 🔥

lowkey a cautionary tale: if the card isn't powered down at reboot, you get a double reboot and then fsck joins the party 😭 not the vibe

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🦋 SEE ALSO 🦋

kernel file ./drivers/watchdog/wdt.c — and the whole friend group is here, bestie:

• wdt_start(9)
• wdt_stop(9)
• wdt_ping(9)
• wdt_set_heartbeat(9)
• wdt_get_status(9)
• wdt_get_temperature(9)
• wdt_interrupt(9)
• wdt_write(9)
• wdt_ioctl(9)
• wdt_open(9)
• wdt_release(9)
• wdt_temp_read(9)
• wdt_temp_open(9)
• wdt_temp_release(9)
• wdt_exit(9)
• wdt_init(9)

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that's the page!! the source is ./drivers/watchdog, dated October 2026, and of course it's wdt_notify_sys(9) — periodt 💜🫶 go read it and slay ✨