linux-kernel - Re: [PATCH v2] powerpc/traps: Enhance readability for trap types

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Date:   Wed, 31 Mar 2021 16:25:51 -0500
From:   Segher Boessenkool <segher@...nel.crashing.org>
To:     Michael Ellerman <mpe@...erman.id.au>
Cc:     Xiongwei Song <sxwjean@...com>, benh@...nel.crashing.org,
        paulus@...ba.org, oleg@...hat.com, npiggin@...il.com,
        christophe.leroy@...roup.eu, msuchanek@...e.de,
        aneesh.kumar@...ux.ibm.com, ravi.bangoria@...ux.ibm.com,
        mikey@...ling.org, haren@...ux.ibm.com, alistair@...ple.id.au,
        jniethe5@...il.com, peterz@...radead.org, leobras.c@...il.com,
        akpm@...ux-foundation.org, rppt@...nel.org, peterx@...hat.com,
        atrajeev@...ux.vnet.ibm.com, maddy@...ux.ibm.com,
        kjain@...ux.ibm.com, kan.liang@...ux.intel.com, aik@...abs.ru,
        pmladek@...e.com, john.ogness@...utronix.de,
        Xiongwei Song <sxwjean@...il.com>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        kvm-ppc@...r.kernel.org
Subject: Re: [PATCH v2] powerpc/traps: Enhance readability for trap types

On Wed, Mar 31, 2021 at 08:58:17PM +1100, Michael Ellerman wrote:
> So perhaps:
> 
>   EXC_SYSTEM_RESET
>   EXC_MACHINE_CHECK
>   EXC_DATA_STORAGE
>   EXC_DATA_SEGMENT
>   EXC_INST_STORAGE
>   EXC_INST_SEGMENT
>   EXC_EXTERNAL_INTERRUPT
>   EXC_ALIGNMENT
>   EXC_PROGRAM_CHECK
>   EXC_FP_UNAVAILABLE
>   EXC_DECREMENTER
>   EXC_HV_DECREMENTER
>   EXC_SYSTEM_CALL
>   EXC_HV_DATA_STORAGE
>   EXC_PERF_MONITOR

These are interrupt (vectors), not exceptions.  It doesn't matter all
that much, but confusing things more isn't useful either!  There can be
multiple exceptions that all can trigger the same interrupt.


Segher