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SubjectRe: [PATCH RESEND] CPU hotplug,x86 Microcode: Don't request microcode from userspace unnecessarily
Date
On Monday, October 10, 2011, Borislav Petkov wrote:
> On Mon, Oct 10, 2011 at 04:58:02PM -0400, Rafael J. Wysocki wrote:
> > On Sunday, October 09, 2011, Srivatsa S. Bhat wrote:
> > > Requesting the microcode from userspace *every time* when onlining CPUs
> > > (during a CPU hotplug operation) is unnecessary.
> > >
> > > So, this patch ensures that once the kernel gets the microcode after booting,
> > > it is not freed nor invalidated when a CPU goes offline, so that it can be
> > > reused when that CPU comes back online, without requesting userspace for it
> > > again. As a result, the CPU hotplug operations become faster as well.
> > >
> > > Tested-by: Borislav Petkov <bp@amd64.org>
> > > Acked-by: Borislav Petkov <bp@amd64.org>
> > >
> > > Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
> >
> > Fine by me. I wonder who should take this?
>
> Ingo, most probably. ucode stuff goes in through -tip.

OK, so

Acked-by: Rafael J. Wysocki <rjw@sisk.pl>

Thanks,
Rafael


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