linux-kernel - RE: [PATCH 10/10] ARC: [plat-eznps] Handle memory error as an exception

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Date:   Thu, 25 May 2017 11:26:32 +0000
From:   Noam Camus <noamca@...lanox.com>
To:     Alexey Brodkin <Alexey.Brodkin@...opsys.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Elad Kanfi <eladkan@...lanox.com>,
        "linux-snps-arc@...ts.infradead.org" 
        <linux-snps-arc@...ts.infradead.org>
Subject: RE: [PATCH 10/10] ARC: [plat-eznps] Handle memory error as an
 exception

> From: Alexey Brodkin [mailto:Alexey.Brodkin@...opsys.com] 
> Sent: Thursday, May 25, 2017 14:15 PM

>> 
>> diff --git a/arch/arc/kernel/entry-compact.S 
>> b/arch/arc/kernel/entry-compact.S index f285dbb..d152d36 100644
>> --- a/arch/arc/kernel/entry-compact.S
>> +++ b/arch/arc/kernel/entry-compact.S
>> @@ -203,6 +203,17 @@ END(handle_interrupt_level2)
>>  ; ---------------------------------------------
>>  ENTRY(mem_service)
>>  
>> +#if defined(CONFIG_EZNPS_MEM_ERROR)
>> +        ; SW workaround to cover up on a difference between
>> +        ; NPS real chip and simulator behaviors.
>> +        ; NPS real chip will activate a machine check exception
>> +        ; in case of memory error, while the simulator will
>> +        ; trigger a level 2 interrupt. Therefor this code section
>> +        ; should be reached only in simulation mode.
>> +        ; DEAD END: display Regs and HALT

>I'm not really buying that.

>Why don't you just make simulator behaving exactly as your real chip?
I can't change simulator core behavior. nSIM is a Synopsys proprietary code.

>Adding those stubs for some corner-cases here and there complicate code, affect maintainability etc.
I agree, any suggestions to still have this but with reduced cost?

-Noam