linux-kernel - Re: [PATCH] identify firmware version

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Message-ID: <4C7FE8B9.4000607@seas.upenn.edu>
Date:	Thu, 02 Sep 2010 14:11:05 -0400
From:	Rafi Rubin <rafi@...s.upenn.edu>
To:	Jiri Slaby <jirislaby@...il.com>
CC:	dmitry.torokhov@...il.com, jkosina@...e.cz,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	micki@...rig.com, rydberg@...omail.se, chatty@...c.fr
Subject: Re: [PATCH] identify firmware version

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On 09/02/10 14:00, Rafi Rubin wrote:
> On 09/02/10 04:03, Jiri Slaby wrote:
>> On 09/02/2010 02:12 AM, Rafi Rubin wrote:
>>>
>>>
>>> On 09/01/2010 04:12 PM, Jiri Slaby wrote:
>>>> On 09/01/2010 11:48 AM, Rafi Rubin wrote:
>>>>> --- a/drivers/hid/hid-ntrig.c
>>>>> +++ b/drivers/hid/hid-ntrig.c
>>>>> @@ -90,6 +90,26 @@ struct ntrig_data {
>>>>>   };
>>>>>
>>>>>
>>>>> +/*
>>>>> + * This function converts the 4 byte raw firmware code into
>>>>> + * a string containing 5 comma separated numbers.
>>>>> + */
>>>>> +static int ntrig_version_string(unsigned char *raw, char *buf)
>>>>> +{
>>>>> +    __u8 a =  (raw[1]&  0b00001110)>>  1;
>>>>> +    __u8 b =  (raw[0]&  0b00111100)>>  2;
>>>>> +    __u8 c = ((raw[0]&  0b00000011)<<  3) | ((raw[3]& 
>>>>> 0b11100000)>>  5);
>>>>> +    __u8 d = ((raw[3]&  0b00000111)<<  3) | ((raw[2]& 
>>>>> 0b11100000)>>  5);
>>>>> +    __u8 e =   raw[2]&  0b00000111;
>>>>
>>>> This won't compile with gcc 3.4 which we still support. Maybe time to
>>>> kill the support?
>>>>
>>>> ...
>>>
>>> Why not?
> 
>> Beacuse it's a gnu extension added in gcc 4.3. (I though it's in gcc 4.0
>> initially, but it's not. So you cannot use it in the kernel code at all.)
> 
> Sorry, would you please clarify "it".  Which bit of syntax in that code is
> unsupported by the older versions of gcc?

I have verified its the binary notation that gcc-3.4 does not support.
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