linux-kernel - Re: [PATCHv2 6/6] media: Convert struct i2c

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Date:	Tue, 18 Sep 2012 13:09:02 -0700
From:	Cody P Schafer <cody@...ux.vnet.ibm.com>
To:	Venu Byravarasu <vbyravarasu@...dia.com>
CC:	Shubhrajyoti D <shubhrajyoti@...com>,
	"linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"julia.lawall@...6.fr" <julia.lawall@...6.fr>,
	Shubhrajyoti Datta <omaplinuxkernel@...il.com>
Subject: Re: [PATCHv2 6/6] media: Convert struct i2c_msg initialization to
 C99 format

On Tue 18 Sep 2012 03:02:42 AM PDT, Venu Byravarasu wrote:
>> -----Original Message-----
>> From: Shubhrajyoti Datta [mailto:omaplinuxkernel@...il.com]
>> Sent: Tuesday, September 18, 2012 3:30 PM
>> To: Venu Byravarasu
>> Cc: Shubhrajyoti D; linux-media@...r.kernel.org; linux-
>> kernel@...r.kernel.org; julia.lawall@...6.fr
>> Subject: Re: [PATCHv2 6/6] media: Convert struct i2c_msg initialization to C99
>> format
>
>>>>        struct i2c_msg test[2] = {
>>>> -             { client->addr, 0,        3, write },
>>>> -             { client->addr, I2C_M_RD, 2, read  },
>>>> +             {
>>>> +                     .addr = client->addr,
>>>> +                     .flags = 0,
>>>
>>> Does flags not contain 0 by default?
>>>
>>
>> It does however I felt that 0 means write so letting it be explicit.
>>
>> In case a removal is preferred that's doable too however felt it is
>> more readable this way.
>
> Though it adds readability, it carries an overhead of one write operation too.
> So, better to remove it.

Partially initialized structs will have their unmentioned members 
initialized to zero.

So there is no "overhead of one write operation" by mentioning it 
explicitly.

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