linux-kernel - Re: [PATCH v2] arch/*/asm/include/bitops.h: api issue, find_*_bit() defination are different with each other

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Date:	Wed, 05 Jun 2013 19:34:50 +0800
From:	Chen Gang <gang.chen@...anux.com>
To:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
CC:	Russell King - ARM Linux <linux@....linux.org.uk>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Linux-Arch <linux-arch@...r.kernel.org>,
	linux-m68k <linux-m68k@...ts.linux-m68k.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2] arch/*/asm/include/bitops.h: api issue, find_*_bit()
 defination are different with each other

On 06/05/2013 03:19 PM, Uwe � wrote:
> Hello,
> 
> On Wed, Jun 05, 2013 at 09:13:01AM +0800, Chen Gang wrote:
>>
>> For arm and m68k, they customize find_*_bit(), but the API is different
>> with 'generic'.
>>
>> avr32, s390, and unicore32 also customize find_*_bit(), but the API is
>> the same with 'generic', and the left architectures all use 'generic'.
>>
>> So need change arm and m68k related API to match the 'generic', then
>> all another modules can face same public API for various architectures.
>>
>> Also beautify code and comments to pass "./scripts/checkpatch.pl"
>>
>>
>> Signed-off-by: Chen Gang <gang.chen@...anux.com>
>> ---
>>  arch/arm/include/asm/bitops.h  |   26 ++++++++++++++++++--------
>>  arch/arm/lib/findbit.S         |   14 ++++++++++----
>>  arch/m68k/include/asm/bitops.h |   25 ++++++++++++++-----------
>>  3 files changed, 42 insertions(+), 23 deletions(-)
>>
>> diff --git a/arch/arm/include/asm/bitops.h b/arch/arm/include/asm/bitops.h
>> index e691ec9..10566c8 100644
>> --- a/arch/arm/include/asm/bitops.h
>> +++ b/arch/arm/include/asm/bitops.h
>> @@ -161,18 +161,28 @@ extern int _test_and_change_bit(int nr, volatile unsigned long * p);
>>  /*
>>   * Little endian assembly bitops.  nr = 0 -> byte 0 bit 0.
>>   */
>> -extern int _find_first_zero_bit_le(const void * p, unsigned size);
>> -extern int _find_next_zero_bit_le(const void * p, int size, int offset);
>> -extern int _find_first_bit_le(const unsigned long *p, unsigned size);
>> -extern int _find_next_bit_le(const unsigned long *p, int size, int offset);
>> +extern unsigned long  _find_first_zero_bit_le(const void *p,
> doesn't checkpatch critizise the double space in the line above?
> 

Thank you very much for your carefully checking (could you tell me how
do you find it ?)  :-)

I need wait for a day at least, if no another suggestions or
completions, I should send patch v3.


>> +						unsigned long size);
>> +extern unsigned long _find_next_zero_bit_le(const void *p, unsigned long size,
>> +						unsigned long offset);
>> +extern unsigned long _find_first_bit_le(const unsigned long *p,
>> +						unsigned long size);
>> +extern unsigned long _find_next_bit_le(const unsigned long *p,
>> +						unsigned long size,
>> +						unsigned long offset);
>>  
>>  /*
>>   * Big endian assembly bitops.  nr = 0 -> byte 3 bit 0.
>>   */
>> -extern int _find_first_zero_bit_be(const void * p, unsigned size);
>> -extern int _find_next_zero_bit_be(const void * p, int size, int offset);
>> -extern int _find_first_bit_be(const unsigned long *p, unsigned size);
>> -extern int _find_next_bit_be(const unsigned long *p, int size, int offset);
>> +extern unsigned long _find_first_zero_bit_be(const void *p,
>> +						unsigned long size);
>> +extern unsigned long _find_next_zero_bit_be(const void *p, unsigned long size,
>> +						unsigned long offset);
>> +extern unsigned long _find_first_bit_be(const unsigned long *p,
>> +						unsigned long size);
>> +extern unsigned long _find_next_bit_be(const unsigned long *p,
>> +						unsigned long size,
>> +						unsigned long offset);
>>  
>>  #ifndef CONFIG_SMP
>>  /*
>> diff --git a/arch/arm/lib/findbit.S b/arch/arm/lib/findbit.S
>> index 64f6bc1..9e3263a 100644
>> --- a/arch/arm/lib/findbit.S
>> +++ b/arch/arm/lib/findbit.S
>> @@ -19,7 +19,8 @@
>>  
>>  /*
>>   * Purpose  : Find a 'zero' bit
>> - * Prototype: int find_first_zero_bit(void *addr, unsigned int maxbit);
>> + * Prototype: unsigned long  find_first_zero_bit(const void *p,
> here is another one.
> 

Thanks.


-- 
Chen Gang

Asianux Corporation
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