** Changed in: zfs-linux (Ubuntu)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1866730
Title:
Need patch for post 5.5 low-latency kernels
Status in zfs-linux package in Ubuntu:
Fix Committed
Bug description:
CONFIG_PREEMPT_RCU=y enabled post 5.4.x kernels have __rcu_read_lock
exposed as GPL-ONLY, which breaks zfs compilation on kernels with that
enabled. (Ubuntu low-latency kernels have that enabled IIRC.)
The patch for the .8 series implementing this inside zfs to circumvent this
issue is here:
https://github.com/openzfs/zfs/commit/2fcab8795c7c493845bfa277d44bc443802000b8
This is from this comment in the relevant issue:
https://github.com/openzfs/zfs/issues/9745#issuecomment-592617605
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