On Tue, 8 Apr 2025 20:18:26 +0200 Matthieu Baerts wrote:
On 02/04/2025 19:23, Stanislav Fomichev wrote:
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.
Good idea to suggest this to find more bugs!
I did some quick tests on my side with our CI, and the MPTCP selftests seem to take a bit more time, but without impacting the results. Hopefully, there will be no impact in slower/busy environments :)
What kind of slow down do you see? I think we get up to 50% more time spent in the longer tests. Not sure how bad is too bad.. I'm leaning towards applying this to net-next and we can see if people running on linux-next complain?
Let me CC kselftests, patch in question: https://lore.kernel.org/all/20250402172305.1775226-1-sdf@fomichev.me/