linux-kernel - Re: [PATCH v9 2/3] x86,/proc/pid/status: Add AVX-512 usage elapsed time

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Message-ID: <efe3e5c9-c477-8a28-5489-c943fe63efaa@linux.intel.com>
Date:   Tue, 12 Feb 2019 17:14:59 +0800
From:   "Li, Aubrey" <aubrey.li@...ux.intel.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Aubrey Li <aubrey.li@...el.com>
Cc:     mingo@...hat.com, peterz@...radead.org, hpa@...or.com,
        ak@...ux.intel.com, tim.c.chen@...ux.intel.com,
        dave.hansen@...el.com, arjan@...ux.intel.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v9 2/3] x86,/proc/pid/status: Add AVX-512 usage elapsed
 time

On 2019/2/12 16:22, Thomas Gleixner wrote:
> On Tue, 12 Feb 2019, Aubrey Li wrote:
>> diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
>> index d53c54b842da..60ee932070fe 100644
>> --- a/arch/x86/include/asm/processor.h
>> +++ b/arch/x86/include/asm/processor.h
>> @@ -996,5 +996,7 @@ enum l1tf_mitigations {
>>  };
>>  
>>  extern enum l1tf_mitigations l1tf_mitigation;
>> +/* Add support for architecture specific output in /proc/pid/status */
>> +extern void arch_proc_pid_status(struct seq_file *m, struct task_struct *task);
> 
> Sigh. This is absolutely the wrong place. The weak function is declared and
> used in fs/proc/... So the prototype wants to be in a header which is
> included from there independent of x86...

Can the prototype be in the architecture header if they want to call the function?
Like the following? arch_report_meminfo() is used in fs/proc/... as well.

$ find . -name *.h | xargs grep arch_report_meminfo
./arch/s390/include/asm/pgtable.h:void arch_report_meminfo(struct seq_file *m);
./arch/x86/include/asm/pgtable_types.h:extern void arch_report_meminfo(struct seq_file *m);
./arch/parisc/include/asm/pgtable.h:extern void arch_report_meminfo(struct seq_file *m);

Thanks,
-Aubrey