Re: VM fixes [4/4]

[David S. Miller]

On Fri, 24 Dec 2004 13:25:13 -0800
William Lee Irwin III <wli@xxxxxxxxxxxxxx> wrote:

> On Fri, 24 Dec 2004 19:22:19 +0100 Andrea Arcangeli <andrea@xxxxxxx> wrote:
> >> If those old cpus really supported smp in linux, then fixing this bit is
> >> trivial, just change it to short. Do they support short at least?
> 
> On Fri, Dec 24, 2004 at 12:55:04PM -0800, David S. Miller wrote:
> > No, they do not.  The smallest atomic unit is one 32-bit word.
> > And yes there are SMP systems using these chips.
> 
> Would systems described as ev56 by /proc/cpuinfo have such chips?

No.  ev4 and earlier have the word or larger load/store limitation.
Only ev5 and later have byte and half-word sized load/store support.

I didn't actually know this when I read your question, so I snooped
around the asm-alpha/ headers and found the comments around the
__alpha_bwx__ ifdef checks. :-)
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