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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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