__save_processor_state(9)

💾 __save_processor_state(9) 💾

okay so this is from the Kernel API Manual (section 9), and it's literally the CPU-register-saving bestie you call before creating a hibernation image and before restoring the memory state from it. No cap, it's a whole vibe. 🦋

🌸 NAME 🌸

__save_processor_state — Save CPU registers before creating a hibernation image and before restoring the memory state from it 💅

✨ SYNOPSIS ✨

void __save_processor_state (struct saved_context *ctxt );

(it's giving "one struct pointer and zero drama," bestie 🎀)

💖 ARGUMENTS 💖

• ctxt — the structure to store the registers contents in. Like, that's the little container where all the saved register data goes. 🫶

⚠️ NOTE ⚠️

listen up, this part is important 👑

If there's a CPU register whose modification by the boot kernel (ie. the kernel used for loading the hibernation image) might affect the operations of the restored target kernel (ie. the one saved in the hibernation image), then its contents must be saved by this function. Periodt. 💀

In other words: if kernel A is hibernated and a different kernel B is used for loading the hibernation image into memory, then kernel A's __save_processor_state function must save all registers needed by kernel A, so that it can operate correctly after the resume regardless of what kernel B does in the meantime. Slay, but make it safe. 🔥

🔗 SEE ALSO 🔗

• Kernel file ./arch/x86/power/cpu.c — and yes, go check out __restore_processor_state(9) too, bestie 👀✨

xoxo, source/version: ./arch/x86/power, dated October 2026, page __save_processor_state(9) 🫶💖