Linux Developers Looking At Retiring The x32 ABI
Linux developers are considering the retirement of the x32 ABI, which was introduced to optimize memory usage on x86_64 processors. The x32 ABI has seen limited adoption since its introduction in 2012, leading to discussions about its removal from the Linux kernel. If the proposal goes through, 2026 may mark the end of the x32 ABI.
- ▪The x32 ABI was designed to use 32-bit pointers while leveraging 64-bit capabilities.
- ▪Limited adoption has led to concerns about its relevance in modern computing.
- ▪Debian and Fedora have disabled x32 by default due to security concerns.
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Linux Developers Looking At Retiring The x32 ABI Written by Michael Larabel in Linux Kernel on 27 May 2026 at 08:53 AM EDT. Add A Comment The Linux x32 ABI for x86_64 processors allow making use of the full 64-bit register file and wide data path but retaining 32-bit pointers to provide for a smaller memory footprint when not needing 64-bit pointers. Linux x32 came to the party late and didn't enjoy much adoption over the years and is now looking at possible removal from the Linux kernel. The x32 code was a nice concept for helping lower memory footprint requirements while otherwise making use of the x86_64 capabilities, but with its limited adoption and x86_64 simply being the de facto standard these days, Linux kernel developers are looking at phasing out the x32 ABI.
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Excerpt limited to ~120 words for fair-use compliance. The full article is at Phoronix.