On Sun, 13 Nov 2005, Dave Jones wrote:
>
> Looks like the Ubuntu people already did this...
Yeah, that looks like a sane patch, although I dislike the #ifdef config
option thing (either it works or it doesn't).
It also does it the right way: using LOCK_PREFIX means that you catch
exactly the users that depend on SMP, and not _all_ "lock" prefixes (as
mentioned, some of the lock prefixes are there as memory fences and are
valid and needed even on UP). So me likee.
The only question being whether you'd actually want to nop out the
spinlock instructions _entirely_ (in addition to changing the nops on
things like semaphores). Without the lock, they're not that expensive, but
hey, it's still a useless (memory-modifying) instruction.
Linus
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