mul_frac(9)

💅 mul_frac(9) — Kernel API Manual, bestie edition 💅

okay so welcome to the Kernel API Manual, where today’s main character is mul_frac(9). she multiplies fixed-point numbers. that’s the whole vibe. 🎀

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🌸 NAME 🌸

mul_frac — multiply two fixed-point numbers. literally her whole job. 💖

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✨ SYNOPSIS ✨

s64 mul_frac (s64 x , s64 y );

that signature is exactly what it is, bestie. no cap. 🫶

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🎀 ARGUMENTS 🎀

• x — the first multiplicand. the first number in the cute little multiplication situation. 💅
• y — the second multiplicand. the other number, also here to multiply. ✨

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💖 RETURN 💖

she returns the result of multiplying two fixed-point numbers. and the result is also a fixed-point number. periodt. 🔥

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🦋 SEE ALSO 🦋

Kernel file: ./drivers/thermal/gov_power_allocator.c. the whole see-also friend group is here, and they are iconic:

• div_frac(9)
• struct power_actor(9)
• struct power_allocator_params(9)
• estimate_sustainable_power(9)
• estimate_pid_constants(9)
• get_sustainable_power(9)
• pid_controller(9)
• power_actor_set_power(9)
• divvy_up_power(9)
• get_governor_trips(9)
• check_power_actors(9)
• power_allocator_bind(9)

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💌 cute little sign-off: this page’s source/version energy is ./drivers/thermal, dated October 2026, and it is literally the mul_frac(9) manual page. mwah 💋