The headline used here is completely misleading. They're ADDING support, not removing it.
"OpenZFS has not yet officially supported PREEMPT_RT kernels. Since Linux 6.12, PREEMPT_RT has been merged into the mainline kernel, making such configurations more accessible; however, this does not imply that OpenZFS has been validated against them. The build may fail, and even if it succeeds, compatibility issues and instability, including possible data corruption, may occur."
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[ 3.1 ms ] story [ 17.3 ms ] thread"OpenZFS has not yet officially supported PREEMPT_RT kernels. Since Linux 6.12, PREEMPT_RT has been merged into the mainline kernel, making such configurations more accessible; however, this does not imply that OpenZFS has been validated against them. The build may fail, and even if it succeeds, compatibility issues and instability, including possible data corruption, may occur."