[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] Re: [PATCH] Fix cpu hotplug bug of mtrr update inconsistency
On 01/06/2010 10:18, "Keir Fraser" <keir.fraser@xxxxxxxxxxxxx> wrote: > I suggest we leave the call where it is, and fix set_mtrr() to not race CPUs > coming online. It is called elsewhere other than mtrr_ap_init() after all. > Also if you call mtrr_ap_init() before being in cpu_online_map, you then > race further MTRR changes: > - CPU X calls mtrr_ap_init() > - CPU Y calls set_mtrr() to actually change an MTRR. > - CPU X adds itself to cpu_online_map > - Aiee, CPU X is missing Y's update > > I'll make a patch. xen-unstable:21499. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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