linux-kernel - Re: [RESEND PATCH 4.0-rc5 v19 6/6] ARM: Add support for on-demand backtrace of other CPUs

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Date:	Wed, 08 Apr 2015 16:35:23 +0800
From:	"Hillf Danton" <hillf.zj@...baba-inc.com>
To:	"Daniel Thompson" <daniel.thompson@...aro.org>
Cc:	"linux-kernel" <linux-kernel@...r.kernel.org>,
	"Russell King" <rmk+kernel@....linux.org.uk>,
	"Steven Rostedt" <rostedt@...dmis.org>
Subject: Re: [RESEND PATCH 4.0-rc5 v19 6/6] ARM: Add support for on-demand backtrace of other CPUs

> 
> +void ipi_cpu_backtrace(struct pt_regs *regs)
> +{
> +	int cpu = smp_processor_id();
> +
> +	if (cpumask_test_cpu(cpu, to_cpumask(backtrace_mask))) {
> +		printk_nmi_backtrace_this_cpu_begin();
> +		pr_warn("FIQ backtrace for cpu %d\n", cpu);
> +		if (regs != NULL)
> +			show_regs(regs);
> +		else
> +			dump_stack();

Help more if we could print both register and stack info.

> +		printk_nmi_backtrace_this_cpu_end();
> +
> +		cpumask_clear_cpu(cpu, to_cpumask(backtrace_mask));
> +	}
> +}



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