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From: Jibin Xu <jibin.xu@windriver.com>
To: Jiri Slaby <jslaby@suse.cz>, <gregkh@linuxfoundation.org>
Cc: <rmk+kernel@armlinux.org.uk>, <mingo@elte.hu>,
	<linux-arm-kernel@lists.infradead.org>, <riel@redhat.com>,
	<linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] sysrq : fix Show Regs call trace on ARM
Date: Mon, 11 Sep 2017 17:55:05 +0800	[thread overview]
Message-ID: <5dd5bb30-15af-ab44-8b56-57c3c1d53bc4@windriver.com> (raw)
In-Reply-To: <8c09c309-e088-1dd6-8d6f-f8929acf0f5f@suse.cz>

Hi,Jiri:

get_irq_regs() in the softirq context return NULL.

thanks,
Jibin Xu

On 2017年09月11日 13:24, Jiri Slaby wrote:
> On 09/11/2017, 05:11 AM, Jibin Xu wrote:
> ...
>> --- a/drivers/tty/sysrq.c
>> +++ b/drivers/tty/sysrq.c
>> @@ -245,8 +245,10 @@ static void sysrq_handle_showallcpus(int key)
>>   	 * architecture has no support for it:
>>   	 */
>>   	if (!trigger_all_cpu_backtrace()) {
>> -		struct pt_regs *regs = get_irq_regs();
>> +		struct pt_regs *regs = NULL;
>>   
>> +		if (in_irq())
>> +			regs = get_irq_regs();
> Maybe a stupid question: how does get_irq_regs() behave in the softirq
> context? I.e. what about s/in_irq/in_interrupt/?
>
> thanks,

  reply	other threads:[~2017-09-11  9:54 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-09-11  3:11 Jibin Xu
2017-09-11  5:24 ` Jiri Slaby
2017-09-11  9:55   ` Jibin Xu [this message]
     [not found]     ` <17da8267-c4aa-dc0f-1150-4fd5efe0073c@windriver.com>
2017-09-13  6:04       ` Jiri Slaby
2017-09-13  6:14         ` Jiri Slaby

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