On Thu, May 19, 2005 at 01:42:28AM +0200, Andi Kleen wrote:
> "Gilbert, John" <[email protected]> writes:
> >
> > I think it's been in there a while, but only really blows up when built
> >
> > under recent kernels.
> >
> > I agree, it's probably not the right way to go.
>
> It's quite dangerous. I suppose it uses this for atomic.h, but it
> means that a mysql compiled under a uniprocessor kernel (or rather
> with a autoconf.h of a uniprocessor kernel, it can even be SMP) will
> have subtle races when run on a SMP system because the atomic
> instructions will miss lock prefixes. Sounds like an open
> deathtrap to me.
>...
They work around this issue by doing
#ifndef CONFIG_SMP
#define CONFIG_SMP
#endif
> -Andi
cu
Adrian
--
"Is there not promise of rain?" Ling Tan asked suddenly out
of the darkness. There had been need of rain for many days.
"Only a promise," Lao Er said.
Pearl S. Buck - Dragon Seed
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