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Subject: Re: [PATCH] [2.5] asm-generic/atomic.h and changes to arm, parisc,
	mips, m68k, sh, cris to use it
From: Luca Barbieri <ldb@ldb.ods.org>
To: Roman Zippel <zippel@linux-m68k.org>
Cc: Linux-Kernel ML <linux-kernel@vger.kernel.org>,
       Alan Cox <alan@lxorguk.ukuu.org.uk>
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On Fri, 2002-08-09 at 00:27, Roman Zippel wrote:
> 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
It shouldn't since it is volatile and the machine has instructions with
memory operands.

Anyway, let's ignore the m68k-specific parts of the patch.


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