linux-kernel - Re: [PATCH 3/3] arm64: include: asm: atomic.h: use 'unsigned int' and 'atomic_t' instead of 'unsigned long' for atomic_clear

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Date:	Fri, 11 Oct 2013 09:18:26 +0800
From:	Chen Gang <gang.chen@...anux.com>
To:	Will Deacon <will.deacon@....com>
CC:	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Catalin Marinas <Catalin.Marinas@....com>,
	"linux390@...ibm.com" <linux390@...ibm.com>,
	"linux-s390@...r.kernel.org" <linux-s390@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/3] arm64: include: asm: atomic.h: use 'unsigned int'
 and 'atomic_t' instead of 'unsigned long' for atomic_clear_mask()

On 10/10/2013 10:23 PM, Will Deacon wrote:
> On Thu, Oct 10, 2013 at 12:03:52PM +0100, Chen Gang wrote:
>> On 10/10/2013 06:07 PM, Will Deacon wrote:
>>> On Thu, Oct 10, 2013 at 03:35:21AM +0100, Chen Gang wrote:
>>>> In current kernel wide source, for arm64, only s390 scsi drivers use
>>>> atomic_clear_mask(), now, s390 itself need use 'unsigned int' and
>>>> 'atomic_t', so need match s390's atomic_clear_mask().
>>>>
>>>>
>>>> Signed-off-by: Chen Gang <gang.chen@...anux.com>
>>>> ---
>>>>  arch/arm64/include/asm/atomic.h |   13 +++++++------
>>>>  1 files changed, 7 insertions(+), 6 deletions(-)
>>>>
>>>> diff --git a/arch/arm64/include/asm/atomic.h b/arch/arm64/include/asm/atomic.h
>>>> index 8363644..58808fc 100644
>>>> --- a/arch/arm64/include/asm/atomic.h
>>>> +++ b/arch/arm64/include/asm/atomic.h
>>>> @@ -126,16 +126,17 @@ static inline int atomic_cmpxchg(atomic_t *ptr, int old, int new)
>>>>  	return oldval;
>>>>  }
>>>>  
>>>> -static inline void atomic_clear_mask(unsigned long mask, unsigned long *addr)
>>>> +static inline void atomic_clear_mask(unsigned int mask, atomic_t *ptr)
>>>>  {
>>>> -	unsigned long tmp, tmp2;
>>>> +	unsigned int tmp;
>>>
>>> Same comment here as for ARM; I think you want a signed int.
>>>
>>
>> OK, replied in patch 2/3 for ARM.
>>
>> BTW: do arm64 need atomic_clear_mask()?
> 
> No. Neither ARM nor arm64 need this function.
> 

OK, thank you for your confirmation.

Hmm... can we remove atomic_clear_mask() from ARM and arm64? (in my
opinion, if not need, better to remove it).

> Will
> 
> 

Thanks.
-- 
Chen Gang
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