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)
Date: Thu Aug 08 2002 - 17:40:17 EST

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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