[PATCH v2 13/14] powerpc/64s: system reset do not trace

[Nicholas Piggin]

Christophe Leroy's on April 4, 2020 12:45 am:
> 
> 
> Le 03/04/2020 à 15:26, Nicholas Piggin a écrit :
>> Similarly to the previous patch, do not trace system reset. This code
>> is used when there is a crash or hang, and tracing disturbs the system
>> more and has been known to crash in the crash handling path.
>> 
>> Acked-by: Naveen N. Rao <naveen.n.rao at linux.vnet.ibm.com>
>> Signed-off-by: Nicholas Piggin <npiggin at gmail.com>
>> ---
>>   arch/powerpc/kernel/traps.c | 5 +++++
>>   1 file changed, 5 insertions(+)
>> 
>> diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
>> index 1845fd7e161a..ed7b7a6e2dc0 100644
>> --- a/arch/powerpc/kernel/traps.c
>> +++ b/arch/powerpc/kernel/traps.c
>> @@ -443,6 +443,9 @@ void system_reset_exception(struct pt_regs *regs)
>>   	unsigned long hsrr0, hsrr1;
>>   	bool nested = in_nmi();
>>   	bool saved_hsrrs = false;
>> +	u8 ftrace_enabled = local_paca->ftrace_enabled;
>> +
>> +	local_paca->ftrace_enabled = 0;
> 
> I predict a build failure here in the near future ...

Will fix. Naveen suggested some helper functions for this too.

Thanks,
Nick