hibernation_snapshot(9)

💖 hibernation_snapshot(9) — kernel API manual, bestie edition 💖

okay so this is hibernation_snapshot(9), straight out of the Kernel API Manual, and it is literally the moment your computer goes "mmkay bestie, everyone freeze, we're making a memory image ✨". buckle up 🎀

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🌸 NAME 🌸

hibernation_snapshot — quiesce devices and create a hibernation image. that's the whole vibe. devices get quiet, image gets made, slay 💅

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✨ SYNOPSIS ✨

int hibernation_snapshot (int platform_mode );

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🦋 ARGUMENTS 🦋

• platform_mode — if it's set, use the platform driver to prepare for the transition. if it's not set… don't. that's the whole rule, no cap 🫶

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💜 DESCRIPTION 💜

okay so this routine must be called with system_transition_mutex held. like, that's not a suggestion, that's the assignment. hold the mutex, then call the function. periodt 🔥

⚠️ for real though — no system_transition_mutex held? that's a you problem, not a function problem, and the manual is very clear about it 😭

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🌈 SEE ALSO 🌈

🫶 the kernel file it lives in:

• ./kernel/power/hibernate.c

and the whole friend group of related functions — go say hi to all of them:

• pm_hibernation_mode_is_suspend(9)
• hibernation_set_ops(9)
• platform_begin(9)
• platform_end(9)
• platform_pre_snapshot(9)
• platform_leave(9)
• platform_finish(9)
• platform_pre_restore(9)
• platform_restore_cleanup(9)
• platform_recover(9)
• swsusp_show_speed(9)
• create_image(9)
• resume_target_kernel(9)
• hibernation_restore(9)
• hibernation_platform_enter(9)
• power_down(9)
• hibernate(9)
• hibernate_quiet_exec(9)
• software_resume_initcall(9)

like, that's a full squad. iykyk 💫

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okay that's the whole page, mwah 💋 — this one lives in ./kernel/power, dated October 2026, and honestly? iconic of it. go hold that system_transition_mutex and make some good choices 🧚‍♀️⭐🍓