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September 13-16, 2022
Dublin, Ireland + Virtual
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Friday, September 16 • 11:45 - 12:25
Lessons Learned When Updating Userspace ABIs - Wolfram Sang, Sang Engineering

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I2C and its subset SMBus are proven technology which have been around since the 1980s and usually simply work. Their functionality has been exposed to Linux userspace as early as 1995 and not much was happening regarding new features. With the release of the SMBus 3.x specification, one minor update was the increase of the maximum block length from 32 to 255 byte. Now, this maximum is exposed to Linux users as part of "good, old" IOCTLs. Updating it needs careful planning to not break userspace applications. Learn here about the process, obstacles, and choices taken in order to provide an improvement to users caused by a minor update of the specification.
Speakers
WS

Wolfram Sang

Kernel Developer & Team Lead, Sang Engineering
Wolfram has been working as a Linux kernel developer for embedded systems since 2008. He maintains the I2C subsystem and works as a consultant and mentor, mainly for the Renesas Upstream Kernel Team. Programming since his childhood, he still hacks his machines from the 80s, especially... Read More →

WolframSang LinuxConEU22 Updating ABI pdf
Friday September 16, 2022 11:45 - 12:25 IST
Auditorium (Level 3)
  LinuxCon, Linux Kernel Development (Advanced & Beginner)