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cb251eae7b
Add a transparent compatibility wrapper for the scx_bpf_sub_dispatch() kfunc in compat.bpf.h. This allows BPF schedulers using the sub-sched dispatch feature to build and run on older kernels that lack the kfunc. To avoid requiring code changes in individual schedulers, the transparent wrapper pattern is used instead of a __COMPAT prefix. The kfunc is declared with a ___compat suffix, while the static inline wrapper retains the original scx_bpf_sub_dispatch() name. When the kfunc is unavailable, the wrapper safely falls back to returning false. This is acceptable because the dispatch path cannot do anything useful without underlying sub-sched support anyway. Tested scx_qmap on v6.14 successfully. Signed-off-by: Cheng-Yang Chou <yphbchou0911@gmail.com> Signed-off-by: Tejun Heo <tj@kernel.org>