Re: [RFC c/r 2/4] [RFC] syscalls, x86: Add __NR_kcmp syscall v7

[Glauber Costa]

>> +	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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