_ctl_compat_mpt_command(9)

📦 version 7.3.1, in nixpkgs unstable

✨ _ctl_compat_mpt_command ✨

okay so first things first, bestie — this page lives in the Kernel API Manual, section 9, and it's all about one tiny little function that does a very specific job. Let's get into it 💅

🌸 NAME 🌸

_ctl_compat_mpt_command — convert 32bit pointers to 64bit.

like, that's literally it. that's the whole vibe. 32 → 64, no cap 🫶

🦋 SYNOPSIS 🦋

long _ctl_compat_mpt_command (struct MPT3SAS_ADAPTER *ioc , unsigned cmd
, void __user *arg );

look at that signature. it's giving "i know exactly what i'm doing" energy ✨

🎀 ARGUMENTS 🎀

  • ioc — the per adapter object. your main character struct, honestly 👑
  • cmd — the ioctl opcode. this is the "what are we even doing here" number 💫
  • arg — a (struct mpt3_ioctl_command32). the payload, the little bundle of data, the ~goods~ 🍓

💖 DESCRIPTION 💖

MPT3COMMAND32 — Handle 32bit applications running on 64bit os.

okay so picture this: you've got a lil 32-bit app chilling on a big grown-up 64-bit OS, and the pointer sizes just do not match up 😭 that's the whole problem this function exists to solve. it's the translator bestie between two worlds, and honestly? iconic. it does the pointer widening so nobody else has to. periodt 💅

ngl it's a super specific job — but somebody's gotta do it, and that somebody is _ctl_compat_mpt_command. slay.

🌈 SEE ALSO 🌈

the friend group is huge, so buckle up 🎀 and also peep the kernel file it all lives in: ./drivers/scsi/mpt3sas/mpt3sas_ctl.c

that's the whole page, bestie — go forth and convert those pointers 💜

🌟 cute lil sign-off: this page came from ./drivers/scsi/mpt3sas and it's dated October 2026, and it's filed under _ctl_compat_mpt_command(9). mwah 💋
📦 where this page comes from