"i386: Add CPU_HAS_SSE2" commit

[Sepherosa Ziehau]

On Fri, Jan 28, 2011 at 10:59 PM, Venkatesh Srinivas
<me at endeavour.zapto.org> wrote:
> Hi,
>
> I just saw commit cbc5d70e... , enabling MFENCE and SFENCE on SSE2 systems,

It is not enabled by default; you will have to add options
CPU_HAS_SSE2 and CPU_HAS_FXSR to kernel config explicitly.
"locked add" is still the default.

> rather than the earlier LOCK ADD [ESP], $0 for cpu_lfence and cpu_mfence.

Best Regards,
sephe

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