Re: [PATCH] WorkStruct: Implement generic UP cmpxchg() where an arch doesn't support it

Roman Zippel
2006-12-07T01:25:01Z

Hi,

On Wed, 6 Dec 2006, Linus Torvalds wrote:

> > > Any _real_ CPU will simply never care about _anything_ else than just the
> > > size of the datum in question.
> >
> > ..or alignment which a dedicated atomic type would allow to be attached.
>
> Can you give any example of a real CPU where alignment matters?
>
> Sure, it needs to be naturally aligned, but that's true of _any_ type in
> the kernel. We don't do unaligneds without "get_unaligned()" and friends.

m68060 produces a trap for unaligned atomic access, unfortunately standard
alignment is smaller than this.

bye, Roman