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54a8340433
linux/arch/powerpc
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Michael Neuling 54a8340433 powerpc: Don't use kernel stack with translation off 
In f761622e59 we changed
early_setup_secondary so it's called using the proper kernel stack
rather than the emergency one.

Unfortunately, this stack pointer can't be used when translation is off
on PHYP as this stack pointer might be outside the RMO.  This results in
the following on all non zero cpus:
  cpu 0x1: Vector: 300 (Data Access) at [c00000001639fd10]
      pc: 000000000001c50c
      lr: 000000000000821c
      sp: c00000001639ff90
     msr: 8000000000001000
     dar: c00000001639ffa0
   dsisr: 42000000
    current = 0xc000000016393540
    paca    = 0xc000000006e00200
      pid   = 0, comm = swapper

The original patch was only tested on bare metal system, so it never
caught this problem.

This changes __secondary_start so that we calculate the new stack
pointer but only start using it after we've called early_setup_secondary.

With this patch, the above problem goes away.

Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2010-08-31 11:35:13 +10:00
..
boot Merge remote branch 'jwb/merge' into merge 2010-08-24 14:36:45 +10:00
configs powerpc: Trim defconfigs 2010-08-09 11:19:16 +10:00
include/asm powerpc: Wire up fanotify_init, fanotify_mark, prlimit64 syscalls 2010-08-24 15:28:28 +10:00
kernel powerpc: Don't use kernel stack with translation off 2010-08-31 11:35:13 +10:00
kvm Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc 2010-08-05 09:03:46 -07:00
lib Merge commit 'paulus-perf/master' into next 2010-07-09 11:25:48 +10:00
math-emu
mm powerpc: Export memstart_addr and kernstart_addr on ppc64 2010-08-24 15:26:26 +10:00
oprofile powerpc/oprofile: Don't build server oprofile drivers on 64-bit BookE 2010-07-14 14:13:54 +10:00
platforms powerpc: Fix config dependency problem with MPIC_U3_HT_IRQS 2010-08-24 15:28:29 +10:00
sysdev Merge branch 'next-devicetree' of git://git.secretlab.ca/git/linux-2.6 2010-08-12 09:11:31 -07:00
xmon Input: sysrq - drop tty argument from sysrq ops handlers 2010-08-19 22:07:06 -07:00
Kconfig Merge branch 'timers-timekeeping-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2010-08-06 13:18:29 -07:00
Kconfig.debug powerpc: Unconditionally enabled irq stacks 2010-06-15 15:02:37 +10:00
Makefile powerpc: Fix typo in uImage target 2010-08-24 15:26:32 +10:00
relocs_check.pl powerpc: Check for unsupported relocs when using CONFIG_RELOCATABLE 2009-09-24 15:31:40 +10:00