mv_write_cached_reg(9)

📦 version 7.3.1, in nixpkgs unstable

💅 mv_write_cached_reg(9) — like, the Kernel API Manual page, bestie ✨

okay so you found your way to mv_write_cached_reg(9), the little kernel API manual page that lives in the Kernel API Manual section, and honestly? she's lowkey iconic. tiny function, big "don't touch the hardware unless you actually have to" energy. let's get into it 🎀

✨ NAME ✨

mv_write_cached_reg — write to a cached port register 🦋

like yes, that's it, that's the whole job description. she writes. to a cached register. and that's on periodt 💅

🌸 SYNOPSIS 🌸

void mv_write_cached_reg (void __iomem *addr , u32 *old , u32 new );

no cap, that's the exact signature ^^ three params, all vibes, returns nothing because she's a void girlie 🫶

🧚 ARGUMENTS 🧚

  • addr — the hardware address of the register. this is the actual physical spot on the chip where the magic happens, typed as void __iomem * because kernel memory is a whole different universe 💀
  • old — pointer to the cached value of the register. think of it as the receipts: what we think is sitting in there right now 📝
  • new — the new value you want the register to have. the glow-up value, if you will ✨

👑 DESCRIPTION 👑

so here's the tea, bestie: mv_write_cached_reg writes a new value to a cached register — but only if the value is different from before. that's the entire flex. if new already equals what's in the cache, she does NOT bother the hardware. she's not doing unnecessary work, she's not writing to a register for fun, she's a "if it ain't broke don't poke it" queen 👑

like, it's giving thoughtful. it's giving efficient. it's giving "I respect the bus" 🌈

🦋 SEE ALSO 🦋

this is the group chat, and everybody's here. the whole SATA MV crew, all from the kernel file ./drivers/ata/sata_mv.c 💖

fr fr, read those next if you wanna understand the whole sata_mv situation. iykyk 🐛

ok that's the page!! now go forth and cache your registers responsibly, bestie 🍓

and that's a wrap on mv_write_cached_reg(9) 🎀 — brought to you by the source dir ./drivers/ata, dated October 2026, mwah 💋💜

📦 where this page comes from