linux-kernel - Re: [PATCH] sysrq : fix Show Regs call trace on ARM

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Date:   Mon, 11 Sep 2017 07:24:54 +0200
From:   Jiri Slaby <jslaby@...e.cz>
To:     Jibin Xu <jibin.xu@...driver.com>, gregkh@...uxfoundation.org
Cc:     rmk+kernel@...linux.org.uk, mingo@...e.hu,
        linux-arm-kernel@...ts.infradead.org, riel@...hat.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] sysrq : fix Show Regs call trace on ARM

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,
-- 
js
suse labs