Re: [PATCH 1/10] Cr4 is valid on some 486s

[Dave Jones <davej@redhat.com>]

On Tue, Nov 15, 2005 at 08:14:29AM -0800, H. Peter Anvin wrote:
 > Dave Jones wrote:
 > >On Tue, Nov 15, 2005 at 05:06:03PM +0100, Arjan van de Ven wrote:
 > > 
 > > > > You still need to preserve the originals so that you can patch in 
 > > both > > directions.  
 > > > 
 > > > why do you insist on both directions? That still sounds like real
 > > > overkill to me.
 > >
 > >cpu hotplug going from UP to SMP ? :)
 > >
 > 
 > If you have CPU hotplug enabled, you can run SMP code!

Sure, but if you boot with 1 CPU, spinlocks get nop'd to emulate UP,
and on a 'installed a new cpu' hotplug event, they all come back.

		Dave

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/