linux-kernel - Re: [PATCH v2 1/3] powerpc: Factor out common code in setup-common.c

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Date:	Tue, 9 Aug 2016 09:30:54 -0700
From:	Andrey Smirnov <andrew.smirnov@...il.com>
To:	Nicholas Piggin <npiggin@...il.com>
Cc:	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	Scott Wood <oss@...error.net>,
	Alessio Igor Bogani <alessio.bogani@...ttra.eu>,
	Paul Mackerras <paulus@...ba.org>,
	Daniel Axtens <dja@...ens.net>
Subject: Re: [PATCH v2 1/3] powerpc: Factor out common code in setup-common.c

On Sun, Jul 31, 2016 at 8:40 PM, Nicholas Piggin <npiggin@...il.com> wrote:
> On Thu, 28 Jul 2016 16:07:16 -0700
> Andrey Smirnov <andrew.smirnov@...il.com> wrote:
>
>> Factor out a small bit of common code in machine_restart(),
>> machine_power_off() and machine_halt().
>>
>> Signed-off-by: Andrey Smirnov <andrew.smirnov@...il.com>
>> ---
>>
>> No changes compared to v1.
>>
>>  arch/powerpc/kernel/setup-common.c | 23 ++++++++++++++---------
>>  1 file changed, 14 insertions(+), 9 deletions(-)
>>
>> diff --git a/arch/powerpc/kernel/setup-common.c
>> b/arch/powerpc/kernel/setup-common.c index 714b4ba..5cd3283 100644
>> --- a/arch/powerpc/kernel/setup-common.c
>> +++ b/arch/powerpc/kernel/setup-common.c
>> @@ -130,15 +130,22 @@ void machine_shutdown(void)
>>               ppc_md.machine_shutdown();
>>  }
>>
>> +static void machine_hang(void)
>> +{
>> +     pr_emerg("System Halted, OK to turn off power\n");
>> +     local_irq_disable();
>> +     while (1)
>> +             ;
>> +}
>
> What's the intended semantics of this function? A default power
> off handler when the platform supplies none?

I was mostly trying to avoid code duplication in
machine_halt/machine_restart/machine_power_off and didn't intend that
function to be used outside. The semantics is just - to hang the CPU
when things didn't go as expected and code that was supposed to
restart/halt/power off the machine failed.

> Would ppc_power_off()
> be a good name?

Calling it "power_off" seems a bit misleading, the function doesn't
really try to do anything related to powering off, really.

Thanks,
Andrey