linux-kernel - Re: [PATCH] ocxl: Add get_metadata IOCTL to share OCXL information to userspace

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Date:   Thu, 22 Feb 2018 14:47:11 +1100
From:   Andrew Donnellan <andrew.donnellan@....ibm.com>
To:     Balbir Singh <bsingharora@...il.com>,
        "Alastair D'Silva" <alastair@....ibm.com>
Cc:     linuxppc-dev <linuxppc-dev@...abs.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Arnd Bergmann <arnd@...db.de>, frederic.barrat@...ibm.com,
        Greg KH <gregkh@...uxfoundation.org>
Subject: Re: [PATCH] ocxl: Add get_metadata IOCTL to share OCXL information to
 userspace

On 22/02/18 14:41, Balbir Singh wrote:
>> Setting it to 0 is for the reader, not the compiler. I'm not clear on
>> the benefit of starting the version at 1, could you clarify?
> 
> How do I distinguish between version number never set and 0?

The ioctl won't exist without a version number set.

-- 
Andrew Donnellan              OzLabs, ADL Canberra
andrew.donnellan@....ibm.com  IBM Australia Limited