pci_clear_mwi(9)

📦 version 7.3.1, in nixpkgs unstable

💅 pci_clear_mwi — like, the Kernel API Manual, bestie ✨

Okay so bestie, welcome to pci_clear_mwi(9) — yes that (9) means it lives in the kernel API manual section, we're in the big leagues now 🎀

🌸 NAME 🌸

pci_clear_mwi — disables Memory-Write-Invalidate for device dev

No cap, that's the whole vibe. It turns the MWI thing OFF for a device. We love a one-job function 👑

✨ SYNOPSIS ✨

void pci_clear_mwi (struct pci_dev *dev );

Look at that signature. Void return, one pointer argument, zero drama. Iconic 🫶

🦋 ARGUMENTS 🦋

  • dev — the PCI device to disable 💖

That's it. That's the argument. It's the PCI device you're turning off MWI for, periodt.

🔥 DESCRIPTION 🔥

So what does it actually do, you ask? It disables PCI Memory-Write-Invalidate transaction on the device. That's the whole thing, fr fr — the function goes in, the MWI gets turned off, and that's a wrap 🌈

Not me being obsessed with how straightforward this is. No hidden behaviour, no extra lore, just disabling Memory-Write-Invalidate transactions on the device you passed in. Slay 💅

👑 SEE ALSO 👑

Okay bestie, sit down, because this list is long. The kernel file lives at ./drivers/pci/pci.c, and these are all its neighbours in the PCI cinematic universe 🍓

Bestie, that's a lot of friends. If you're looking for the opposite move — turning MWI on — you want pci_set_mwi(9) or pci_try_set_mwi(9) in that list up there 👀

🧚 sign-off 🧚

That's the whole page, bestie! It ships from ./drivers/pci, dated October 2026, and it's titled pci_clear_mwi(9). Go forth and disable those Memory-Write-Invalidate transactions, you absolute main character 💜💖✨

📦 where this page comes from