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Date:   Thu, 28 May 2020 09:10:09 +0800
From:   Yuehaibing <yuehaibing@...wei.com>
To:     Guenter Roeck <linux@...ck-us.net>, <nchatrad@....com>,
        <jdelvare@...e.com>
CC:     <linux-hwmon@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -next] hwmon: (amd_energy) Fix build error

On 2020/5/27 21:22, Guenter Roeck wrote:
> On 5/27/20 6:02 AM, YueHaibing wrote:
>> If CONFIG_NEED_MULTIPLE_NODES is n, building fails:
>>
>> drivers/hwmon/amd_energy.c: In function ‘amd_energy_read’:
>> ./include/asm-generic/topology.h:51:36: error: void value not ignored as it ought to be
>>      #define cpumask_of_node(node) ((void)node, cpu_online_mask)
>> ./include/linux/cpumask.h:618:72: note: in definition of macro ‘cpumask_first_and’
>>  #define cpumask_first_and(src1p, src2p) cpumask_next_and(-1, (src1p), (src2p))
>>                                                                         ^~~~~
>> drivers/hwmon/amd_energy.c:194:6: note: in expansion of macro ‘cpumask_of_node’
>>       cpumask_of_node
>>       ^~~~~~~~~~~~~~~
>> ./include/asm-generic/topology.h:51:46: warning: left-hand operand of comma expression has no effect [-Wunused-value]
>>      #define cpumask_of_node(node) ((void)node, cpu_online_mask)
>>                                               ^
>> ./include/linux/cpumask.h:618:72: note: in definition of macro ‘cpumask_first_and’
>>  #define cpumask_first_and(src1p, src2p) cpumask_next_and(-1, (src1p), (src2p))
>>                                                                         ^~~~~
>> drivers/hwmon/amd_energy.c:194:6: note: in expansion of macro ‘cpumask_of_node’
>>       cpumask_of_node
>>       ^~~~~~~~~~~~~~~
>>
>> Fixes: 8abee9566b7e ("hwmon: Add amd_energy driver to report energy counters")
>> Signed-off-by: YueHaibing <yuehaibing@...wei.com>
>> ---
>>  drivers/hwmon/amd_energy.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/hwmon/amd_energy.c b/drivers/hwmon/amd_energy.c
>> index bc8b643a37d5..9d5cd3057866 100644
>> --- a/drivers/hwmon/amd_energy.c
>> +++ b/drivers/hwmon/amd_energy.c
>> @@ -192,7 +192,7 @@ static int amd_energy_read(struct device *dev,
>>  	if (channel >= data->nr_cpus) {
>>  		cpu = cpumask_first_and(cpu_online_mask,
>>  					cpumask_of_node
>> -					(channel - data->nr_cpus));
>> +					((channel - data->nr_cpus)));
> 
> Wrong fix. The correct fix is to fix the macro, not its caller.
> A patch to fix the macro has been submitted.
> 
Thanks, missing that.

> Guenter
> 
> 
>>  		amd_add_delta(data, channel, cpu, val, false);
>>  	} else {
>>  		cpu = channel;
>>
> 
> 
> 

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