wakeup_source_activate(9)

💤 wakeup_source_activate(9) — the "bestie is awake now" page

okay so this is a page from the Kernel API Manual, and honestly? It's a little one but it's a baddie. It's about telling the kernel "hey, this thing right here? it's awake, it's doing stuff, clock it." ✨

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🌸 NAME

wakeup_source_activate — Mark given wakeup source as active.

Like, literally that. You're stamping the vibe check as active. 💅

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🎀 SYNOPSIS

void wakeup_source_activate (struct wakeup_source *ws );

Returns nothing (void), takes one thing. Simple. Elegant. Iconic.

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🦋 ARGUMENTS

• ws — Wakeup source to handle. That's the one you're activating, bestie. She's the main character here. 👑

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🔥 DESCRIPTION

So here's what happens: you call this and it updates the ws' statistics — yes, she keeps receipts 📊 — and, if ws has just been activated, it notifies the PM core of the event by incrementing the counter of the wakeup events being processed. ✨

That's the whole thing. It's short but it's doing real work. No cap.

tiny heads up: the notification part only fires if ws has just been activated. So it's not like "every single time, always." The counter bump is conditional, and now you know. 🫶

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🌈 SEE ALSO

Grab a snack, this is the whole group chat 🍓 — it's a lot of friends:

• wakeup_source_create(9)
• wakeup_source_destroy(9)
• wakeup_source_add(9)
• wakeup_source_remove(9)
• wakeup_source_register(9)
• wakeup_source_unregister(9)
• wakeup_sources_read_lock(9)
• wakeup_sources_read_unlock(9)
• wakeup_sources_walk_start(9)
• wakeup_sources_walk_next(9)
• device_wakeup_attach(9)
• device_wakeup_enable(9)
• device_wakeup_attach_irq(9)
• device_wakeup_detach_irq(9)
• device_wakeup_arm_wake_irqs(9)
• device_wakeup_disarm_wake_irqs(9)
• device_wakeup_detach(9)
• device_wakeup_disable(9)
• device_set_wakeup_capable(9)
• device_set_wakeup_enable(9)
• wakeup_source_not_usable(9)
• wakeup_source_report_event(9)
• __pm_stay_awake(9)
• pm_stay_awake(9)
• wakeup_source_deactivate(9)
• __pm_relax(9)
• pm_relax(9)
• pm_wakeup_timer_fn(9)
• pm_wakeup_ws_event(9)
• pm_wakeup_dev_event(9)
• pm_wakeup_pending(9)
• pm_get_wakeup_count(9)
• pm_save_wakeup_count(9)
• pm_wakep_autosleep_enabled(9)
• print_wakeup_source_stats(9)
• wakeup_sources_stats_seq_show(9)
• bpf_wakeup_sources_read_lock(9)
• bpf_wakeup_sources_read_unlock(9)
• bpf_wakeup_sources_get_head(9)

Also! Kernel file: ./drivers/base/power/wakeup.c — that's where she lives. Go say hi. 🧚

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💖 sign-off

This lil masterpiece comes from ./drivers/base/power, dated October 2026. Read it, love it, cite it in your patch notes. mwah 💋 🎀