From: gang.chen@asianux•com (Chen Gang)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH] ARM: include: asm: atomic.h: use type cast 's64' for the return value of atomic64_add_return().
Date: Tue, 24 Sep 2013 18:37:25 +0800 [thread overview]
Message-ID: <52416B65.4070601@asianux.com> (raw)
In-Reply-To: <20130924102736.GA12758@n2100.arm.linux.org.uk>
On 09/24/2013 06:27 PM, Russell King - ARM Linux wrote:
> On Tue, Sep 24, 2013 at 10:30:41AM +0100, Will Deacon wrote:
>> On Sat, Sep 21, 2013 at 12:06:47PM +0100, Chen Gang wrote:
>>> diff --git a/arch/arm/include/asm/atomic.h b/arch/arm/include/asm/atomic.h
>>> index da1c77d..8cf005d 100644
>>> --- a/arch/arm/include/asm/atomic.h
>>> +++ b/arch/arm/include/asm/atomic.h
>>> @@ -475,7 +475,7 @@ static inline int atomic64_add_unless(atomic64_t *v, u64 a, u64 u)
>>> return ret;
>>> }
>>>
>>> -#define atomic64_add_negative(a, v) (atomic64_add_return((a), (v)) < 0)
>>> +#define atomic64_add_negative(a, v) ((s64)atomic64_add_return((a), (v)) < 0)
>>> #define atomic64_inc(v) atomic64_add(1LL, (v))
>>> #define atomic64_inc_return(v) atomic64_add_return(1LL, (v))
>>> #define atomic64_inc_and_test(v) (atomic64_inc_return(v) == 0)
>>
>> Is this the right fix? It looks more like atomic[64]_t should be signed, but
>> some 32-bit architectures (ARM, x86, tile) are actually implementing
>> atomic64_t as u64. Furthermore, there are discrepencies in the operands to
>> the various atomic64_* function (long long vs u64) which probably need
>> sorting out.
>
> Even though our underlying type is u64, we could change the arguments to
> be 'long long' as per the asm-generic/atomic64.h version. Remember that
> this is ARM specific code, and we know that long long == 64-bit int.
>
>
That sounds reasonable, too, I will change them in patch v2 for arm
(also for tile).
Thanks.
--
Chen Gang
next prev parent reply other threads:[~2013-09-24 10:37 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-09-21 11:06 [PATCH] ARM: include: asm: atomic.h: use type cast 's64' for the return value of atomic64_add_return() Chen Gang
2013-09-24 9:30 ` Will Deacon
2013-09-24 10:27 ` Russell King - ARM Linux
2013-09-24 10:37 ` Chen Gang [this message]
2013-09-24 10:30 ` Chen Gang
2013-09-25 2:25 ` [PATCH v2] ARM: include: asm: use 'long long' instead of 'u64' within atomic.h Chen Gang
2013-09-25 16:07 ` Will Deacon
2013-09-26 2:00 ` Chen Gang
2013-09-26 10:04 ` Will Deacon
2013-09-26 11:03 ` Chen Gang
2013-09-27 11:06 ` Will Deacon
2013-09-27 11:36 ` Chen Gang
2013-09-29 3:43 ` [PATCH 0/2] ARM: include: asm: change functions' and variables' types in atomic.h Chen Gang
2013-09-29 3:43 ` [PATCH 1/2] ARM: include: asm: use 'long long' instead of 'u64' within atomic.h Chen Gang
2013-09-29 3:52 ` [PATCH 2/2] ARM: include: asm: use 'int' instead of 'unsigned long' for normal register variables " Chen Gang
2013-09-30 16:11 ` Will Deacon
2013-10-01 2:05 ` Chen Gang
2013-10-01 9:01 ` Will Deacon
2013-10-01 12:03 ` Chen Gang
2013-10-02 10:41 ` Will Deacon
2013-10-02 15:19 ` Chen Gang
2013-10-03 10:05 ` Chen Gang
2013-10-03 16:32 ` Will Deacon
2013-10-04 9:51 ` Chen Gang
2013-10-04 15:37 ` Will Deacon
2013-10-04 15:42 ` Will Deacon
2013-10-04 23:55 ` Chen Gang
2013-10-05 0:11 ` Chen Gang
2013-10-08 4:10 ` Chen Gang
2013-10-08 10:34 ` Will Deacon
2013-10-08 10:56 ` [PATCH v2 0/2] ARM: include: asm: change functions' and variables' types in atomic.h Chen Gang
2013-10-08 10:57 ` [PATCH v2 1/2] ARM: include: asm: use 'long long' instead of 'u64' within atomic.h Chen Gang
2013-10-08 10:59 ` [PATCH v2 2/2] ARM: include: asm: use 'int' instead of 'unsigned long' for 'oldval' in atomic_cmpxchg() Chen Gang
2013-10-09 10:48 ` Will Deacon
2013-10-10 0:56 ` Chen Gang
2013-10-09 10:46 ` [PATCH v2 1/2] ARM: include: asm: use 'long long' instead of 'u64' within atomic.h Will Deacon
2013-10-08 11:00 ` [PATCH 2/2] ARM: include: asm: use 'int' instead of 'unsigned long' for normal register variables " Chen Gang
2013-10-08 10:33 ` Will Deacon
2013-10-08 11:29 ` Chen Gang
2013-10-08 17:49 ` Will Deacon
2013-10-09 0:18 ` Chen Gang
2013-10-09 1:22 ` Chen Gang
2013-09-30 16:07 ` [PATCH 1/2] ARM: include: asm: use 'long long' instead of 'u64' " Will Deacon
2013-10-01 2:09 ` Chen Gang
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