[PATCH v5 1/4] printk/nmi: generic solution for safe printk in NMI

[Russell King - ARM Linux]

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+kernel at arm.linux.org.uk>

-- 
RMK's Patch system: http://www.arm.linux.org.uk/developer/patches/
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