linux-kernel - Re: [PATCH 1/2] staging: gdm724x: Remove test for host endian

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Message-ID: <5564A6A9.3000607@kerneldev.net>
Date:	Tue, 26 May 2015 12:00:25 -0500
From:	Jaime Arrocha <jarrocha@...neldev.net>
To:	Dan Carpenter <dan.carpenter@...cle.com>,
	Jaime Arrocha <jarr@...neldev.net>
CC:	gregkh@...uxfoundation.org, jonathankim@...semi.com,
	deanahn@...semi.com, devel@...verdev.osuosl.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] staging: gdm724x: Remove test for host endian


On 05/26/2015 10:59 AM, Dan Carpenter wrote:
> On Tue, May 26, 2015 at 10:29:44AM -0500, Jaime Arrocha wrote:
>> This is the first patch of two. Both patches perform a small clean up
>> done to the section for host endian test. Instead of handling endianness
>> internally, kernel functions were added for use.
>
>> The second patch depends on the first one, it is just a small piece
>> that is no longer needed.
>
> This kind of dependencies are built in the the name patch 1/2 and 2/2.
> We don't want this kind of meta commentary in the permanent changelog.
> If it were needed then it would go under the --- cut off line.
>
> And anyway, fold patch 1 & 2 together into one patch.  Do "one thing"
> per patch instead of half a thing per patch.
>

Thanks for the feedback. I'll do the corrections needed.

>>
>> Signed-off-by: Jaime Arrocha <jarr@...neldev.net>
>> ---
>
> <--- meta commentary goes here.
>
>>   drivers/staging/gdm724x/gdm_endian.c |   52 +++++++++++++++-------------------
>>   1 file changed, 23 insertions(+), 29 deletions(-)
>>
>> diff --git a/drivers/staging/gdm724x/gdm_endian.c b/drivers/staging/gdm724x/gdm_endian.c
>> index f6cc90a..609a433 100644
>> --- a/drivers/staging/gdm724x/gdm_endian.c
>> +++ b/drivers/staging/gdm724x/gdm_endian.c
>> @@ -11,57 +11,51 @@
>>    * GNU General Public License for more details.
>>    */
>>
>> -#include <linux/slab.h>
>
> Is this related to endianness?
>

This was needed because the original code uses memcpy() inside 
gdm_set_endian() to test for host endianness.

>> +#include<asm/byteorder.h>
>> +#ifdef __LITTLE_ENDIAN
>> +#include<linux/byteorder/little_endian.h>
>> +#else
>> +#include<linux/byteorder/big_endian.h>
>> +#endif
>
> Why do we need this?  Also the spacing is wrong.
>

Yes,this needs to go. It was from an old change where I was obtaining 
host endianness. It will be replaced by linux/byteorder/generic.h

>>   u16 gdm_cpu_to_dev16(struct gdm_endian *ed, u16 x)
>>   {
>> -	if (ed->dev_ed == ed->host_ed)
>> -		return x;
>> -
>> -	return Endian16_Swap(x);
>> +	if (ed->dev_ed == ENDIANNESS_LITTLE)
>> +		return __cpu_to_le16(x);
>> +	else
>> +		return __cpu_to_be16(x);
>
> Use cpu_to_le16() no underscore versions everywhere.  The other is for
> code which is shared with usespace.
>
> regards,
> dan carpenter
>
>

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