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⇱ RISC-V Zalasr Support Now Under Review For The Linux Kernel - Phoronix

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RISC-V Zalasr Support Now Under Review For The Linux Kernel

Written by Michael Larabel in RISC-V on 5 September 2025 at 05:35 AM EDT. Add A Comment
Linux kernel patches for supporting RISC-V's Zalasr ISA extension are now under review. This extension provides "real" load acquire/store release instructions for RISC-V processors.

Zalasr provides atomic Load-Acquire Store-Release support. Its v0.9 ISA spec was finalized two months ago and its public review period wrapped up in August.

Given the freshness of the Zalasr ISA exntesion, the Linux kernel support patches have so far only been tested with a patched version of QEMU providing its emulated Zalasr support. Within the Linux kernel, Zalasr can be used for the smp_load_acquire and smp_store_release functionality in place of fence instructions.

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Those interested in RISC-V Zalasr support can see this mailing list patch series for that pending Linux kernel support.

Michael Larabel is the principal author of Phoronix.com and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 20,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated benchmarking software. He can be followed via Twitter, LinkedIn, or contacted via MichaelLarabel.com.