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Recent change [0] resulted in a "BUG: using __this_cpu_read() in preemptible" splat [1]. PREEMPT kernels have additional requirements on what can and can not run with/without preemption enabled. Expose those constrains in the debug kernels. 0: https://lore.kernel.org/netdev/20250314120048.12569-2-justin.iurman@uliege.be/ 1: https://lore.kernel.org/netdev/20250402094458.006ba2a7@kernel.org/T/#mbf72641e9d7d274daee9003ef5edf6833201f1bc Signed-off-by: Stanislav Fomichev <sdf@fomichev.me> Reviewed-by: Simon Horman <horms@kernel.org> Acked-by: Matthieu Baerts (NGI0) <matttbe@kernel.org> Link: https://patch.msgid.link/20250402172305.1775226-1-sdf@fomichev.me Signed-off-by: Jakub Kicinski <kuba@kernel.org>