On Tue, Aug 03, 2010 at 03:31:09PM -0700, Jeff Ohlstein wrote:
> 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?
Try this - I've only build-tested this so far:
diff --git a/arch/arm/kernel/head-common.S b/arch/arm/kernel/head-common.S
index b9505aa..98949b2 100644
--- a/arch/arm/kernel/head-common.S
+++ b/arch/arm/kernel/head-common.S
@@ -143,7 +143,7 @@ __error:
b 1b
ENDPROC(__error)
-
+ __CPUINIT
/*
* Read processor ID register (CP#15, CR0), and look up in the linker-built
* supported processor list. Note that we can't use the absolute addresses
@@ -235,6 +235,7 @@ ENTRY(lookup_machine_type)
ldmfd sp!, {r4 - r6, pc}
ENDPROC(lookup_machine_type)
+ __HEAD
/* Determine validity of the r2 atags pointer. The heuristic requires
* that the pointer be aligned, in the first 16k of physical RAM and
* that the ATAG_CORE marker is first and present. Future revisions
diff --git a/arch/arm/kernel/head.S b/arch/arm/kernel/head.S
index eb62bf9..7e0a673 100644
--- a/arch/arm/kernel/head.S
+++ b/arch/arm/kernel/head.S
@@ -104,6 +104,7 @@ ENTRY(stext)
ENDPROC(stext)
#if defined(CONFIG_SMP)
+ __CPUINIT
ENTRY(secondary_startup)
/*
* Common entry point for secondary CPUs.
@@ -202,7 +203,7 @@ __turn_mmu_on:
mov pc, r3
ENDPROC(__turn_mmu_on)
-
+ __HEAD
/*
* Setup the initial page tables. We only setup the barest
* amount which are required to get the kernel running, which
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