[PATCH] powerpc/power8: fix secondary CPUs hanging on boot for HV=0

[Michael Neuling]

Michael Neuling <mikey at neuling.org> wrote:

> In __restore_cpu_power8 we determine if we are HV and if not, we return
> before setting HV only resources.
> 
> Unfortunately we forgot to restore the link register from r11 before
> returning.
> 
> This will happen on boot and with secondary CPUs not coming online.
> 
> This adds the missing link register restore.
> 
> Signed-off-by: Michael Neuling <mikey at neuling.org>

cc: stable at kernel.org

> 
> diff --git a/arch/powerpc/kernel/cpu_setup_power.S b/arch/powerpc/kernel/cpu_setup_power.S
> index ea847ab..1167008 100644
> --- a/arch/powerpc/kernel/cpu_setup_power.S
> +++ b/arch/powerpc/kernel/cpu_setup_power.S
> @@ -66,6 +66,7 @@ _GLOBAL(__restore_cpu_power8)
>  	bl	__init_FSCR
>  	mfmsr	r3
>  	rldicl.	r0,r3,4,63
> +	mtlr	r11
>  	beqlr
>  	li	r0,0
>  	mtspr	SPRN_LPID,r0