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author | Matt Evans <matt@ozlabs.org> | 2010-07-07 23:55:37 +0200 |
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committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2010-07-31 06:56:30 +0200 |
commit | fc53b4202e61c7e9008c241933ae282aab8a6082 (patch) | |
tree | c279a5256ba18a27ca0b785ecf6819f592a23509 /arch/powerpc/kernel/paca.c | |
parent | Merge commit 'jwb/next' into next (diff) | |
download | linux-fc53b4202e61c7e9008c241933ae282aab8a6082.tar.xz linux-fc53b4202e61c7e9008c241933ae282aab8a6082.zip |
powerpc/kexec: Switch to a static PACA on the way out
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>
Diffstat (limited to 'arch/powerpc/kernel/paca.c')
-rw-r--r-- | arch/powerpc/kernel/paca.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/paca.c b/arch/powerpc/kernel/paca.c index f88acf0218db..3db8d64f40e1 100644 --- a/arch/powerpc/kernel/paca.c +++ b/arch/powerpc/kernel/paca.c @@ -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) |