linux-kernel - Re: [PATCH] arch: *: remove '__init' for setup_profiling

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Message-ID: <5271F4A9.40804@asianux.com>
Date:	Thu, 31 Oct 2013 14:11:53 +0800
From:	Chen Gang <gang.chen@...anux.com>
To:	Vineet Gupta <Vineet.Gupta1@...opsys.com>
CC:	"linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
	Mike Frysinger <vapier@...too.org>,
	"James E.J. Bottomley" <jejb@...isc-linux.org>,
	Helge Deller <deller@....de>, Arnd Bergmann <arnd@...db.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
	realmz paranoid <realmz6@...il.com>,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"uclinux-dist-devel@...ckfin.uclinux.org" 
	<uclinux-dist-devel@...ckfin.uclinux.org>,
	Parisc List <linux-parisc@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] arch: *: remove '__init' for setup_profiling_timer()

On 10/31/2013 01:45 PM, Vineet Gupta wrote:
> On 10/23/2013 07:36 AM, Chen Gang wrote:
>> Most of architectures not use '__init' for setup_profiling_timer(), so
>> need remove it, or can generate warning (e.g. arc with allmodconfig):
>>
>>     MODPOST vmlinux.o
>>   WARNING: vmlinux.o(.text+0x3c682): Section mismatch in reference from the function write_profile() to the function .init.text:setup_profiling_timer()
>>   The function write_profile() references
>>   the function __init setup_profiling_timer().
>>   This is often because write_profile lacks a __init
>>   annotation or the annotation of setup_profiling_timer is wrong.
>>
>>
>> Signed-off-by: Chen Gang <gang.chen@...anux.com>
>> ---
>>  arch/arc/kernel/smp.c          |    2 +-
>>  arch/blackfin/mach-bf561/smp.c |    2 +-
>>  arch/parisc/kernel/smp.c       |    2 +-
>>  3 files changed, 3 insertions(+), 3 deletions(-)
>>
>> diff --git a/arch/arc/kernel/smp.c b/arch/arc/kernel/smp.c
>> index bca3052..3bdac11 100644
>> --- a/arch/arc/kernel/smp.c
>> +++ b/arch/arc/kernel/smp.c
>> @@ -187,7 +187,7 @@ int __cpu_up(unsigned int cpu, struct task_struct *idle)
>>  /*
>>   * not supported here
>>   */
>> -int __init setup_profiling_timer(unsigned int multiplier)
>> +int setup_profiling_timer(unsigned int multiplier)
>>  {
>>  	return -EINVAL;
>>  }
>> diff --git a/arch/blackfin/mach-bf561/smp.c b/arch/blackfin/mach-bf561/smp.c
>> index 11789be..3bef058 100644
>> --- a/arch/blackfin/mach-bf561/smp.c
>> +++ b/arch/blackfin/mach-bf561/smp.c
>> @@ -43,7 +43,7 @@ void __init platform_prepare_cpus(unsigned int max_cpus)
>>  	init_cpu_present(&mask);
>>  }
>>  
>> -int __init setup_profiling_timer(unsigned int multiplier) /* not supported */
>> +int setup_profiling_timer(unsigned int multiplier) /* not supported */
>>  {
>>  	return -EINVAL;
>>  }
>> diff --git a/arch/parisc/kernel/smp.c b/arch/parisc/kernel/smp.c
>> index 8a252f2..2e8cd36 100644
>> --- a/arch/parisc/kernel/smp.c
>> +++ b/arch/parisc/kernel/smp.c
>> @@ -433,7 +433,7 @@ int __cpu_up(unsigned int cpu, struct task_struct *tidle)
>>  }
>>  
>>  #ifdef CONFIG_PROC_FS
>> -int __init
>> +int
>>  setup_profiling_timer(unsigned int multiplier)
>>  {
>>  	return -EINVAL;
> 
> In theory this change is OK. However this is legacy code at best and it would be
> better to define a weak definition in kernel/profile.c and remove this cruft from
> relevant arches. I'll send out a patch.
> 

That sounds good to me.

> -Vineet
> 
> 


-- 
Chen Gang
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