Russell King - ARM Linux wrote:
On Thu, Jul 22, 2010 at 12:33:08PM -0700, smuckle@xxxxxxxxxxxxxx wrote:
Changing things so
that the code required for bringing up secondary cores is still present
after init looks to be a fairly big change. As such I wanted to see if
anyone had thoughts here before I start hacking up head.S, the linker
script, etc.
No need to hack the linker script - all you need to do is to ensure that
the required parts of code are placed in the cpuinit sections - and there's
a macro to do that called "__CPUINIT" (which equates to a .section
directive.)
You'll need to ensure that stuff which shouldn't be in the cpuinit
section remains as-is, so you'll have to also add __INIT or
.section .text as appropriate.
So I've been looking into this, and it does look like I need to change
the linker script. I need the secondary_startup function to be around at
hotplug time, and it appears that the whole head section gets freed with
the init section. Does it seem sane to make it so the head section isn't
freed when hotplug is configured? Or should I move the secondary startup
function out of the head section?
Thanks,
Jeff
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