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Commitc27cea4416("rcu: Re-implement RCU Tasks Trace in terms of SRCU-fast") broke map_kptr selftest since it removed the function we were kprobing. Use a new kfunc that invokes call_rcu_tasks_trace and sets a program provided pointer to an integer to 1. Technically this can be unsafe if the memory being written to from the callback disappears, but this is just for usage in a test where we ensure we spin until we see the value to be set to 1, so it's ok. Reported-by: Shung-Hsi Yu <shung-hsi.yu@suse.com> Fixes:c27cea4416("rcu: Re-implement RCU Tasks Trace in terms of SRCU-fast") Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com> Link: https://lore.kernel.org/r/20260211185747.3630539-1-memxor@gmail.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>