Re: [PATCH v3 2/2] eal/linux: Add support for handling built-in kernel modules

[Kamil Rytarowski <krytarowski@caviumnetworks.com>]

W dniu 08.12.2015 o 08:25, Panu Matilainen pisze:
> On 12/07/2015 10:55 PM, Stephen Hemminger wrote:
>> On Mon, 7 Dec 2015 19:36:05 +0100
>> Kamil Rytarowski <Kamil.Rytarowski@caviumnetworks.com> wrote:
>>
>>> +    /* Check if there is sysfs mounted */
>>> +    if (stat("/sys/module", &st) != 0) {
>>> +        RTE_LOG(DEBUG, EAL, "Open /sys/module failed: %s\n",
>>> +            strerror(errno));
>>>           return -1;
>>>       }
>>
>> This check is useless.
>> If /sys/module does not exist then /sys/module/XXX won't exist either.
>
> Yes, but non-mounted sysfs is an error whereas /sys/module/XXX is 
> merely an existence test, and the current sole caller in 
> pci_vfio_enable() even bothers checking for the difference. So its 
> perhaps a bit academic but its not incorrect.
>
> At any rate, the debug messages are incorrect/misleading. It's 
> certainly not trying to *open* these directories so it should not 
> claim to do so.
>

Yes, this check is to determine whether there is sysfs mounted. It's 
different than checking if there is a module loaded.

This seems academical, but it retains the original behavior.

I will try to improve the logging.

>     - Panu -
>
>
>