Re: PATCH: Support MIPS II

["H . J . Lu" <hjl at lucon dot org>]

On Thu, Apr 25, 2002 at 02:59:53PM -0700, Richard Henderson wrote:
> On Thu, Apr 25, 2002 at 01:51:16PM -0700, H . J . Lu wrote:
> > +#ifndef _BITS_ATOMICITY_H 
> > +
> > +#define _BITS_ATOMICITY_H 1
> > +
> > +static inline int
> > +__attribute__ ((unused))
> > +__exchange_and_add (volatile _Atomic_word *__mem, int __val)
> > +{
> > +  int __result = *__mem;
> > +  *__mem += __val;
> > +  return __result;
> > +}
> 
> At minimum this should have the same #warning that m68k has
> about not actually being atomic.
> 

I am enclosing a new patch.

> And really this is incorrect for any operating system that
> emulates ll/sc.  Like Linux, and I suspect others.
> 

Even on Linux, it is hard to tell if the kernel really supports ll/sc
emulation or not. I just want to help real MIPS II cores.


H.J.

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