irq_chip_compose_msi_msg(9)

📦 version 7.3.1, in nixpkgs unstable

✨ irq_chip_compose_msi_msg ✨

okay bestie, so this one is from the Kernel API Manual — literally the irq_chip_compose_msi_msg(9) page, and it's giving very niche-but-iconic interrupt energy 🎀. She's small, she's specific, she slays exactly one job, and we're gonna get into it.

🌸 NAME 🌸

irq_chip_compose_msi_msg — compose the MSI message for an irq chip 💌

🦋 SYNOPSIS 🦋

int irq_chip_compose_msi_msg (struct irq_data *data , struct msi_msg
*msg );

periodt, that's the whole signature, no notes 💅

🎀 ARGUMENTS 🎀

  • data — pointer to interrupt specific data. like, the interrupt's whole little personality file 🫶
  • msg — pointer to the MSI message. this is the message she's gonna fill in, bestie ✨

💜 DESCRIPTION 💜

So here's the tea ☕: for hierarchical domains, we go find the first chip in the hierarchy that implements the irq_compose_msi_msg callback. like, we're walking up the chain until somebody answers the door 🚪✨

For non hierarchical ones? We just use the top level chip. simple, no drama, main character energy 👑

👑 SEE ALSO 👑

Kernel file ./kernel/irq/chip.c — and honestly the whole squad is listed here, so buckle up 🍓:

like, that's the entire friend group and they all showed up to the function 💀🔥

ngl this page is short but she's very clear about who she is and what she does, and honestly? we respect it 🧚

and that's the whole vibe, bestie 💖 this icon lives in ./kernel/irq, dated October 2026, from the Kernel API Manual — irq_chip_compose_msi_msg(9), mwah 💋✨🌸

📦 where this page comes from