linux-kernel - Re: [RFC PATCH 5/8] qaic: Implement data path

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Message-ID: <d34d726d-7911-824d-82ac-34358874b103@codeaurora.org>
Date:   Thu, 14 May 2020 10:12:03 -0600
From:   Jeffrey Hugo <jhugo@...eaurora.org>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     arnd@...db.de, manivannan.sadhasivam@...aro.org,
        bjorn.andersson@...aro.org, wufan@...eaurora.org,
        pratanan@...eaurora.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 5/8] qaic: Implement data path

On 5/14/2020 9:56 AM, Greg KH wrote:
> On Thu, May 14, 2020 at 09:06:53AM -0600, Jeffrey Hugo wrote:
>> On 5/14/2020 8:14 AM, Greg KH wrote:
>>> On Thu, May 14, 2020 at 08:07:43AM -0600, Jeffrey Hugo wrote:
>>>> +struct qaic_execute {
>>>> +	__u16		ver;    /* struct version, must be 1 */
>>>
>>> No need for structures to be versioned.  If you change something, then
>>> add a new ioctl if you really needed it.
>>
>> Huh.  We had thought the botching ioctls document advised having a version,
>> but as I double check that document, it infact does not.
>>
>> Will remove.
> 
> Thanks, you can also remove the "reserved" variables as well as those
> will not be needed either.

Are you sure?

Documentation/process/botching-up-ioctls.rst
Starting at Line 38:

"Pad the entire struct to a multiple of 64-bits if the structure 
contains 64-bit types - the structure size will otherwise differ on 
32-bit versus 64-bit. Having a different structure size hurts when 
passing arrays of structures to the kernel, or if the kernel checks the 
structure size, which e.g. the drm core does."

The "reserved" variables seem to be in line with that.

-- 
Jeffrey Hugo
Qualcomm Technologies, Inc. is a member of the
Code Aurora Forum, a Linux Foundation Collaborative Project.