pci_try_set_mwi(9)

📦 version 7.3.1, in nixpkgs unstable

💅 pci_try_set_mwi(9)

okay so bestie, we're in the Kernel API Manual, and this page is called pci_try_set_mwi — yes the (9) is part of the name, it's giving "section 9, kernel internals, very demure" 🎀

✨ NAME ✨

pci_try_set_mwi — turns on memory-write-invalidate PCI transactions 💫

🦋 SYNOPSIS 🦋

int pci_try_set_mwi (struct pci_dev *dev );

🌸 ARGUMENTS 🌸

  • dev — the PCI device that's gonna get MWI enabled on it. that's the whole vibe, that's the whole parameter 🫶

⭐ DESCRIPTION ⭐

so what it does is it enables the Memory-Write-Invalidate transaction, in PCI_COMMAND. that's it, that's the function. lowkey iconic for how straightforward it is 💅

and bestie, here's the fun part — callers are not required to check the return value. no cap. you can just call it and move on with your life, main character energy ✨

🔥 RETURN 🔥

on error you get an appropriate -ERRNO error value. on success? zero. that's it. zero is the slay outcome 👑

🌈 SEE ALSO 🌈

okay so this is the long part, don't panic 🙈 — it lives in the kernel file ./drivers/pci/pci.c, and the whole PCI extended family is here, and yes we're listing every single one of them because we don't do "etc." in this house 🫶

and that's the whole page bestie, you ate that 💜

signing off from ./drivers/pci 🐧 — this one's the October 2026 edition of pci_try_set_mwi(9), so if you quote it in a group chat, cite it properly, iykyk 🌟

📦 where this page comes from