Fix kernel version checks for RHEL9 #171
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Description
RedHat has been inexplicably cherry-picking breaking changes from later kernel versions. Unfortunately this means that
KERNEL_VERSION_CODEchecks are insufficient to ensure compatibility in some cases, and we need to check if we're building for RHEL 9.X.Since I do not have easy access to the RHEL 9 kernel Git history, I don't know when they cherry-picked the
PDE_DATAcommit (hence the guess of RHEL 9.1)Relevant Linux commits that they cherry picked:
Tested the build on rocky 9.4 and Debian with kernel 6.12.3