For SMP, Is platform specific secondary startup functionreally needed?

John Linn John.Linn at
Wed Apr 6 10:42:48 EDT 2011

> -----Original Message-----
> From: linux-arm-kernel-bounces at [mailto:linux-arm-
> kernel-bounces at] On Behalf Of Catalin Marinas
> Sent: Wednesday, April 06, 2011 8:39 AM
> To: John Linn
> Cc: linux at; linux-arm-kernel at
> Subject: Re: For SMP, Is platform specific secondary startup
> functionreally needed?
> On Wed, 2011-04-06 at 14:48 +0100, John Linn wrote:
> > I'm doing some cleanup of SMP patches based on Russell and Catalin's
> > input which was real helpful. It seems to me that there is not
> a
> > need for a platform specific secondary startup.
> >
> > I have tested with just letting CPU1 go straight to
> secondary_startup()
> > in head.S and it works fine.
> >
> > I'm probably missing something obvious, if so can you share it?
> We use the pen release mechanism serialise the secondary CPUs booting.

I'm not saying you can't have it, just that some platforms may not need

Maybe I'm oversimplifying the boot process for our platform, but it
seems to 
be working fine.

-- John

> --
> Catalin
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