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From: Kumar Gala <galak@kernel.crashing.org>
To: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: Andrew Morton <akpm@linux-foundation.org>, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] local_t : powerpc extension - use long for powerpc32
Date: Thu, 15 Feb 2007 15:29:59 -0600	[thread overview]
Message-ID: <3D84FDC0-3AA0-4144-A255-19D2E20AF0AA@kernel.crashing.org> (raw)
In-Reply-To: <20070215212259.GA3466@Krystal>


On Feb 15, 2007, at 3:23 PM, Mathieu Desnoyers wrote:

> * Kumar Gala (galak@kernel.crashing.org) wrote:
>>
>> On Feb 15, 2007, at 2:02 PM, Mathieu Desnoyers wrote:
>>
>>> * Kumar Gala (galak@kernel.crashing.org) wrote:
>>>> is there a reason this isn't local_add_return(long a, local_t  
>>>> *l) on
>>>> ppc32?
>>>>
>>>> (same comment for other functions)
>>>>
>>>> - k
>>>
>>> no, except that we use the code is taken from atomic.h and used an
>>> int parameter. However, due to the semantics of local_t, we should
>>> manipulate longs instead of ints, even if they are the same size  
>>> on a
>>> given architecture (ppc32 and mips32 are affectec by this).
>>>
>>> Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
>>
>> Right, this means we can simply for ppc version down to:
>>
>> +static __inline__ int local_add_return(int a, local_t *l)
>> +{
>> +	int t;
>> +
>> +	__asm__ __volatile__(
>> +"1:	PPC_LLARX	%0,0,%2		# local_add_return\n\
>> +	add	%0,%1,%0\n"
>> +	PPC405_ERR77(0,%2)
>> +"	PPC_STLCX	%0,0,%2 \n\
> what about the dot after stwcx ? (stwcx.) ? Is it no longer required ?

Its implied, PPC_LLARX and PPC_STLCW are #defines that expand to  
proper instructions.

(look in include/asm-powerpc/asm-compat.h) for the defines.

Also, the PPC405_ERR77 will preprocess out on ppc64 if you were  
concerned.

- k

  reply	other threads:[~2007-02-15 21:30 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-02-11 19:18 [PATCH 00/10] local_t : adding and standardising local atomic primitives Mathieu Desnoyers
2007-02-11 19:18 ` [PATCH 01/10] local_t : architecture independant extension Mathieu Desnoyers
2007-02-11 19:18 ` [PATCH 02/10] local_t : alpha extension Mathieu Desnoyers
2007-02-11 19:18 ` [PATCH 03/10] local_t : i386 extension Mathieu Desnoyers
2007-02-11 19:18 ` [PATCH 04/10] local_t : ia64 extension Mathieu Desnoyers
2007-02-11 19:18 ` [PATCH 05/10] local_t : mips extension Mathieu Desnoyers
2007-02-11 19:18 ` [PATCH 06/10] local_t : parisc cleanup Mathieu Desnoyers
2007-02-11 19:18 ` [PATCH 07/10] local_t : powerpc extension Mathieu Desnoyers
2007-02-15  6:56   ` Andrew Morton
2007-02-15  7:20     ` Mathieu Desnoyers
2007-02-15 14:50       ` Kumar Gala
2007-02-15 20:02         ` [PATCH] local_t : powerpc extension - use long for powerpc32 Mathieu Desnoyers
2007-02-15 20:35           ` Kumar Gala
2007-02-15 21:23             ` Mathieu Desnoyers
2007-02-15 21:29               ` Kumar Gala [this message]
2007-02-15 21:32             ` Mathieu Desnoyers
2007-02-15 21:43             ` [PATCH] local_t : powerpc extension - shrink powerpc local.h Mathieu Desnoyers
2007-02-11 19:18 ` [PATCH 08/10] local_t : s390 cleanup Mathieu Desnoyers
2007-02-11 19:18 ` [PATCH 09/10] local_t : sparc64 cleanup Mathieu Desnoyers
2007-02-11 19:18 ` [PATCH 10/10] local_t : x86_64 extension Mathieu Desnoyers

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