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

[Jibin Xu]

Hi,Jiri:

get_irq_regs() in the softirq context return NULL.

thanks,
Jibin Xu

On 2017å09æ11æ 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,