linux-kernel - Re: [PATCH 0001/0001] format idle IP output func+offset/length

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Date:   Mon, 6 Nov 2017 17:05:28 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
To:     "Liu, Changcheng" <changcheng.liu@...el.com>
Cc:     Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        jpoimboe@...hat.com, Petr Mladek <pmladek@...e.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0001/0001] format idle IP output func+offset/length

On (11/06/17 13:25), Liu, Changcheng wrote:
> kaslr feature is enabled in kernel.
> Remove kernel text address when dumping idle IP info
> 
> Signed-off-by: Liu Changcheng <changcheng.liu@...el.com>
> Signed-off-by: Jerry Liu <primerlink@...il.com>
> 
> diff --git a/lib/nmi_backtrace.c b/lib/nmi_backtrace.c
> index 0bc0a35..9cc4178 100644
> --- a/lib/nmi_backtrace.c
> +++ b/lib/nmi_backtrace.c
> @@ -92,7 +92,7 @@ bool nmi_cpu_backtrace(struct pt_regs *regs)
>  	if (cpumask_test_cpu(cpu, to_cpumask(backtrace_mask))) {
>  		arch_spin_lock(&lock);
>  		if (regs && cpu_in_idle(instruction_pointer(regs))) {
> -			pr_warn("NMI backtrace for cpu %d skipped: idling at pc %#lx\n",
> +			pr_warn("NMI backtrace for cpu %d skipped: idling at pc %pS\n",
		       I guess the word 'pc' can be dropped from the message ^^

there seems to be other cases in the kernel when we print regs->pc/regs->ip.

	-ss

>  				cpu, instruction_pointer(regs));
>  		} else {
>  			pr_warn("NMI backtrace for cpu %d\n", cpu);