On Thu, Apr 21, 2016 at 01:48:42PM +0200, Petr Mladek wrote:
> diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
> index cdfa6c2b7626..259543ec6dc9 100644
> --- a/arch/arm/Kconfig
> +++ b/arch/arm/Kconfig
> @@ -66,6 +66,7 @@ config ARM
>       select HAVE_KRETPROBES if (HAVE_KPROBES)
>       select HAVE_MEMBLOCK
>       select HAVE_MOD_ARCH_SPECIFIC
> +     select HAVE_NMI
>       select HAVE_OPROFILE if (HAVE_PERF_EVENTS)
>       select HAVE_OPTPROBES if !THUMB2_KERNEL
>       select HAVE_PERF_EVENTS
> diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c
> index baee70267f29..df90bc59bfce 100644
> --- a/arch/arm/kernel/smp.c
> +++ b/arch/arm/kernel/smp.c
> @@ -644,9 +644,11 @@ void handle_IPI(int ipinr, struct pt_regs *regs)
>               break;
>  
>       case IPI_CPU_BACKTRACE:
> +             printk_nmi_enter();
>               irq_enter();
>               nmi_cpu_backtrace(regs);
>               irq_exit();
> +             printk_nmi_exit();
>               break;
>  
>       default:

For the above,

Acked-by: Russell King <rmk+ker...@arm.linux.org.uk>

-- 
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