Re: [PATCH] [2.5] asm-generic/atomic.h and changes to arm, parisc, mips, m68k, sh, cris to use it

From: Roman Zippel (zippel@linux-m68k.org)
Date: Thu Aug 08 2002 - 17:27:39 EST

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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