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powerpc/kexec: Switch to a static PACA on the way out

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With dynamic PACAs, the kexecing CPU's PACA won't lie within the kernel
static data and there is a chance that something may stomp it when preparing
to kexec.  This patch switches this final CPU to a static PACA just before
we pull the switch.

Signed-off-by: Matt Evans <matt@ozlabs.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Matt Evans
2010-07-07 21:55:37 +00:00
committed by Benjamin Herrenschmidt
parent 7e3f36c3e1
commit fc53b4202e
4 changed files with 31 additions and 11 deletions
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10
arch/powerpc/kernel/paca.c
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@@ -105,6 +105,16 @@ void __init initialise_paca(struct paca_struct *new_paca, int cpu)
#endif /* CONFIG_PPC_STD_MMU_64 */
}
/* Put the paca pointer into r13 and SPRG_PACA */
void setup_paca(struct paca_struct *new_paca)
{
local_paca = new_paca;
mtspr(SPRN_SPRG_PACA, local_paca);
#ifdef CONFIG_PPC_BOOK3E
mtspr(SPRN_SPRG_TLB_EXFRAME, local_paca->extlb);
#endif
}
static int __initdata paca_size;
void __init allocate_pacas(void)