msr_write(9)

💅 msr_write(9) — the kernel API manual, bestie edition 🎀

okay so real talk, this is a page from the Kernel API Manual, and it's about msr_write(9). it's short, it's sweet, and it slays at exactly one job. let's get into it 🦋

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✨ NAME ✨

msr_write — write an MSR, but like... with error handling 💖

that's the whole vibe. you write the MSR, and it tells you if something went wrong. no cap, that's the main character energy we love 👑

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🌸 SYNOPSIS 🌸

int msr_write (u32 msr , struct msr *m );

look at her. two args, one int coming back. iconic. the spacing is exactly like that, don't @ me, i don't make the rules 🫶

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⭐ ARGUMENTS ⭐

• msr — the MSR you wanna write to. this is a u32, it's the which one of the situation 🎯
• m — the value you're writing. it's a struct msr *, and yes bestie it's a pointer, so it's the what of the situation 💫

two little inputs, one big responsibility. the way that 🥹

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🔥 RETURN 🔥

• 0 — success!! we ate, nothing burned down, go treat yourself 🍓
• anything else — that's an error code, and no it's not zero, so like... pay attention 😭

bestie please actually check the return value. 0 means slay, non-zero means something went sideways. don't just ignore it and act surprised later 💀

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🌈 SEE ALSO 🌈

• the kernel file ./arch/x86/lib/msr.c — that's where the lore lives 📖
• msr_read(9) — the sibling, the reader, the other half of the duo 💜
• msr_set_bit(9) — when you only wanna touch one bit, lowkey efficient ✨
• msr_clear_bit(9) — same but the opposite, and honestly? we love a symmetrical queen 🧚

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and that's the whole page, bestie!! no filler, all facts, zero notes 💅

big kiss from the kernel file ./arch/x86/lib, dated October 2026 — go forth and write those MSRs responsibly, mwah 🫶🎀