linux-kernel - Re: [PATCH 3/6] hwmon: jc42: use bitops' sign

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Date:	Sun, 11 Jan 2015 11:34:15 +0100
From:	Martin Kepplinger <martink@...teo.de>
To:	Guenter Roeck <linux@...ck-us.net>
CC:	peterz@...radead.org, mingo@...nel.org, tytso@....edu,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/6] hwmon: jc42: use bitops' sign_extend16

Am 2014-12-16 um 08:17 schrieb Martin Kepplinger:
> Am 2014-12-15 um 22:29 schrieb Guenter Roeck:
>> On Mon, Dec 15, 2014 at 05:18:34PM +0100, Martin Kepplinger wrote:
>>> ---
>>
>> Some description would be nice. Also, please consider adding
>> relevant subsystem mailing lists and maintainers to your patches.
>>
> 
> I shouldn't have added the Signed-off-by line to some of them. Sorry.
> 
> The driver-patches are meant to be examples of what can be changed if
> the sign_extend functions are added. I don't know if they are taken and
> planned to post the driver patches (probably more) thereafter, and of
> course to the relevant people.

Is this sign_extendXX() set of functions considered to be added to
bitops.h ?

Just checking if I can prepare some driver-patches (the ones I posted
are just examples, meant to be re-sent to relevant maintainers when it's
time), or not.

thanks

> 
>>>  drivers/hwmon/jc42.c | 5 ++---
>>>  1 file changed, 2 insertions(+), 3 deletions(-)
>>>
>>> diff --git a/drivers/hwmon/jc42.c b/drivers/hwmon/jc42.c
>>> index 388f8bc..335a2de 100644
>>> --- a/drivers/hwmon/jc42.c
>>> +++ b/drivers/hwmon/jc42.c
>>> @@ -31,6 +31,7 @@
>>>  #include <linux/hwmon-sysfs.h>
>>>  #include <linux/err.h>
>>>  #include <linux/mutex.h>
>>> +#include <linux/bitops.h>
>>>  
>>>  /* Addresses to scan */
>>>  static const unsigned short normal_i2c[] = {
>>> @@ -215,9 +216,7 @@ static int jc42_temp_from_reg(s16 reg)
>>>  {
>>>  	reg &= 0x1fff;
>>>  
>> If I understand the code in sign_extend16 correctly, the above mask
>> should no longer be necessary.
> 
> exactly. The mask would then be shifting. Thanks!
> 
>>
>> Thanks,
>> Guenter
>>
>>> -	/* sign extend register */
>>> -	if (reg & 0x1000)
>>> -		reg |= 0xf000;
>>> +	reg = sign_extend16(reg, 12);
>>>  
>>>  	/* convert from 0.0625 to 0.001 resolution */
>>>  	return reg * 125 / 2;
>>> -- 
>>> 2.1.3
>>>
>>> --
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> 

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