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Date:	Wed, 10 Oct 2007 10:22:49 +1000
From:	Mark Nelson <markn@....ibm.com>
To:	Badari Pulavarty <pbadari@...il.com>
Cc:	ext4 <linux-ext4@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>, cmm@...ibm.com,
	"Amit K. Arora" <aarora@...ux.vnet.ibm.com>
Subject: Re: [patch 1/2] add init_ext4_proc() stub for when CONFIG_PROC_FS
 is not set

Badari Pulavarty wrote:
> On Tue, 2007-10-09 at 15:50 +1000, markn@....ibm.com wrote:
>> plain text document attachment (ext4-add-init_ext4_proc-stub.patch)
>> init_ext4_fs() calls init_ext4_proc() so we need a stub init_ext4_proc()
>> for the case that CONFIG_PROC_FS is not set.
>> Without the stub we get a build error:
>>
>> fs/ext4/mballoc.c: In function 'init_ext4_proc':
>> fs/ext4/mballoc.c:2837: error: 'proc_root_fs' undeclared (first use in this function)
>> fs/ext4/mballoc.c:2837: error: (Each undeclared identifier is reported only once
>> fs/ext4/mballoc.c:2837: error: for each function it appears in.)
>>
>> Add a stub init_ext4_proc() function that does nothing but return 0
>>
>> Signed-off-by: Mark Nelson <markn@....ibm.com>
>> ---
>>  fs/ext4/mballoc.c |    7 +++++++
>>  1 file changed, 7 insertions(+)
>>
>> Index: ext4/fs/ext4/mballoc.c
>> ===================================================================
>> --- ext4.orig/fs/ext4/mballoc.c
>> +++ ext4/fs/ext4/mballoc.c
>> @@ -2825,6 +2825,7 @@ static int ext4_mb_destroy_per_dev_proc(
>>  	return 0;
>>  }
>>  
>> +#ifdef CONFIG_PROC_FS
>>  int __init init_ext4_proc(void)
>>  {
>>  	ext4_pspace_cachep =
>> @@ -2840,6 +2841,12 @@ int __init init_ext4_proc(void)
>>  
>>  	return 0;
>>  }
>> +#else
>> +int __init init_ext4_proc(void)
>> +{
>> +	return 0;
>> +}
>> +#endif
>>  
>>  void exit_ext4_proc(void)
>>  {
> 
> Nope. I don't think we can do this :(
> 
> For example, we need to create ext4_pspace_cachep kmem cache 
> for the pre-allocation to work. We can't ifdef it out.

This is definitely something I'll leave to the experts then :)
At least you guys know about this now I guess.

Sorry again Andrew.


Thanks all!

Mark.

> 
> Mingming/Amit, can you take a look at this ? It looks like
> we NEED procfs support to make mballoc work. If so, we need
> to add it to the dependency.
> 
> 
> Thanks,
> Badari
> 

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