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SubjectRe: [RFC c/r 2/4] [RFC] syscalls, x86: Add __NR_kcmp syscall v7
>> +	case KCMP_SYSVSEM:
>> +#ifdef CONFIG_SYSVIPC
>> + ret = kcmp_ptr((long)task1->sysvsem.undo_list,
>> + (long)task2->sysvsem.undo_list,
>> + KCMP_SYSVSEM);
>> +#else
>> + ret = -EINVAL;
>
> ENOTSUP is better, I think. because of, EINVAL implicitly mean _caller_ is wrong.
> but in this case, it is not bad. only the kernel doesn't have enough feature.
>

Isn't it usually the case for ENOSYS, then ?



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