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

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Date:	Thu, 31 Oct 2013 14:14:39 +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 02:11 PM, Chen Gang wrote:
> 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.
> 

Hmm... if so, recommend to modify another architectures which also only
return "-EINVAL", but without "__init" prefix.


Thanks.
-- 
Chen Gang
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