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I wasted a couple of hours recently after accidentally adding a defer() from within a function which itself was called as part of defer(). This leads to an infinite loop of defer(). Make sure this cannot happen and raise a helpful exception. I understand that the pair of _ksft_defer_arm() calls may not be the most Pythonic way to implement this, but it's easy enough to understand. Reviewed-by: Petr Machata <petrm@nvidia.com> Link: https://patch.msgid.link/20260108225257.2684238-2-kuba@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>