Following x86_64, ARM, ARM64, LoongArch and RISC-V, IBM s390 is slated to be the next CPU architecture seeing Rust support within the Linux kernel.
IBM engineer Jan Polensky explained with the patch series:
"Rust support on s390 requires a small set of architecture-specific pieces before the generic Rust kernel infrastructure can be used.
The series wires up s390 as a Rust-capable 64-bit architecture, adds the missing assembly interfaces needed by Rust for WARN/BUG reporting and for static branches, and adjusts bindgen parameters to avoid repr layout conflicts caused by packed and aligned s390 structures.
s390 currently requires a nightly rustc due to -Zpacked-stack, and the minimum tool version gating is adjusted accordingly."
This patch series just affecting a few dozen lines of code across four patches is all that's needed for getting the Rust programming language support in the Linux kernel up and running for IBM Z / s390.
The patches are currently under review and given the small amount of code churn we'll see if this gets picked up time for next month's Linux v7.2 kernel cycle.