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 ABI was introduced many years ago with limited adoption and maintenance overhead is now prompting its re-evaluation for removal from the Linux kernel.
This reflects an ongoing optimization and streamlining effort within core software infrastructure, impacting developers and potentially resource-constrained systems.
The Linux kernel may drop support for a niche ABI, simplifying its codebase and potentially enforcing a stronger 64-bit standard.
- · Linux Kernel Developers
- · Open Source Ecosystem
- · Niche x32 ABI Users
The Linux kernel removes code supporting the x32 ABI.
Developers maintaining software that still relies on x32 ABI would need to port their applications to 64-bit.
This could slightly reduce the attack surface or complexity of the Linux kernel, improving security or maintainability in the long run.
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