validate_cmdline_cstate(9)

💅 validate_cmdline_cstate(9) — Kernel API Manual 💅

okay so bestie, welcome to the Kernel API Manual page for validate_cmdline_cstate. This one is literally about validating a C-state from cmdline, and it's giving very specific, very iconic energy. 🎀✨

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🌸 NAME 🌸

validate_cmdline_cstate — Validate a C-state from cmdline. No cap, that's the whole vibe. 💖

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🦋 SYNOPSIS 🦋

int validate_cmdline_cstate (struct cpuidle_state *state , struct cpuidle_state *prev_state );

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⭐ ARGUMENTS ⭐

• state — The C-state to validate. This is the main character C-state you're checking. 👑
• prev_state — The previous C-state in the table or NULL. So either it has a neighbor in the table, or it's solo with NULL. 🫶

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🔥 RETURN 🔥

0 if the C-state is valid or -EINVAL otherwise. That's it, bestie: valid gives you 0, not valid gives you -EINVAL. Periodt. 💅

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🌈 SEE ALSO 🌈

Kernel file ./drivers/idle/intel_idle.c plus these iconic functions:

• intel_idle(9)
• intel_idle_s2idle(9)
• intel_idle_cst_usable(9)
• ivt_idle_state_table_update(9)
• irtl_2_usec(9)
• bxt_idle_state_table_update(9)
• sklh_idle_state_table_update(9)
• skx_is_pc6_disabled(9)
• skx_idle_state_table_update(9)
• spr_idle_state_table_update(9)
• drop_pc6_redundant_cstates(9)
• byt_cht_auto_demotion_disable(9)
• intel_idle_cpuidle_driver_init(9)
• intel_idle_cpu_init(9)
• intel_idle_cpuidle_devices_uninit(9)
• cmdline_table_adjust(9)

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source/version: ./drivers/idle · date: October 2026 · manual: validate_cmdline_cstate(9) — byeee, drink water and validate your C-states responsibly 💖✨🦋