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On Wed, Apr 08, 2026 at 10:21:46AM +0530, Saket Kumar Bhaskar wrote: > >> We do have cpumask as [] array in sched_group: >> >> struct sched_group { >> struct sched_group *next; /* Must be a circular list */ >> atomic_t ref; >> >> unsigned int group_weight; >> unsigned int cores; >> struct sched_group_capacity *sgc; >> int asym_prefer_cpu; /* CPU of highest priority in group */ >> int flags; >> >> /* >> * The CPUs this group covers. >> * >> * NOTE: this field is variable length. (Allocated dynamically >> * by attaching extra space to the end of the structure, >> * depending on how many CPUs the kernel has booted up with) >> */ >> unsigned long cpumask[]; >> }; > > For now. But given how utterly broken flex arrays are, this thing will > be gone the second we run into that same thing again. > >> Wouldn't be good if it is used as: >> >> cpumask0 = sg->cpumask[0]; > > I'm thinking Alexei's point is that this test should not rely on random > kernel code. > looks like we already have struct bpf_testmod_struct_arg_3 { int a; int b[]; }; and function int bpf_testmod_test_struct_arg_3(int a, int b, struct bpf_testmod_struct_arg_2 c); ...in selftests/bpf/test_kmods/bpf_testmod.c so we could potentially use that instead. Alan