linux-kernel - Re: [PATCH] local_t : powerpc extension

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Message-Id: <906FD21B-59B6-4A30-90F0-914E0CD3CFBF@kernel.crashing.org>
Date:	Thu, 15 Feb 2007 14:35:22 -0600
From:	Kumar Gala <galak@...nel.crashing.org>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] local_t : powerpc extension - use long for powerpc32


On Feb 15, 2007, at 2:02 PM, Mathieu Desnoyers wrote:

> * Kumar Gala (galak@...nel.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@...ymtl.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\
+	bne-	1b"
+	: "=&r" (t)
+	: "r" (a), "r" (&(l->a.counter))
+	: "cc", "memory");
+
+	return t;
+}

and that should work for both ppc32 & ppc64 and removes the  
duplication between the two.

- k

-
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