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Implementing BPF version of preempt_count() requires accessing lowcore from BPF. Since lowcore can be relocated, open-coding (struct lowcore *)0 does not work, so add a kfunc. Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com> Link: https://lore.kernel.org/r/20260217160813.100855-2-iii@linux.ibm.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>