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Date: Fri, 9 Aug 2002 00:27:39 +0200 (CEST)
From: Roman Zippel <zippel@linux-m68k.org>
X-X-Sender: roman@serv
To: Luca Barbieri <ldb@ldb.ods.org>
cc: Linux-Kernel ML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] [2.5] asm-generic/atomic.h and changes to arm, parisc,
 mips, m68k, sh, cris to use it
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Hi,

On 9 Aug 2002, Luca Barbieri wrote:

> - Didn't implement atomic_{add,sub,inc,dec}_return. This is currently
> not used in the generic kernel but it can be useful.

m68k has a cmpxchg like instruction, which can be used for that.

> - Had inline assembly for things the compiler should be able to generate
> on its own

The compiler can cache the value in a register, the assembly forces that
into memory. __ARCH_ATOMIC_HAVE_MEMORY_OPERANDS won't work because of
that.

bye, Roman

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