linux-kernel - Re: [PATCH] reiserfs: select CRC32 and BITREVERSE for REISERFS

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Date:	Fri, 27 Mar 2009 16:28:49 +0800
From:	Coly Li <coly.li@...e.de>
To:	Randy Dunlap <randy.dunlap@...cle.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] reiserfs: select CRC32 and BITREVERSE for REISERFS_FS
 Kconfig entry



Randy Dunlap Wrote:
> Coly Li wrote:
>> In patch fs-reiserfs-return-f_fsid-for-statfs2-v2.patch (from mmotm), crc32_le()
>> is referenced. If reiserfs is compiled into kernel and crc32_le() is compiled as
>> kernel module, there might be a compiling error as:
>>     fs/built-in.o: In function `reiserfs_statfs':
>>     super.c:(.text+0x7332b): undefined reference to `crc32_le'
>>     super.c:(.text+0x7333f): undefined reference to `crc32_le'
>> This patch select CRC32 and BITREVERSE for REISERFS_FS Kconfig entry, which
>> indicates compiling crc32_le() into kernel.
>>
>> Thanks to Randy Dunlap for pointing out this error and providing helpful solution.
>>
>> Signed-off-by: Coly Li <coly.li@...e.de>
>> Cc: Randy Dunlap <randy.dunlap@...cle.com>
> 
> Acked-by: Randy Dunlap <randy.dunlap@...cle.com>
> Tested-by: Randy Dunlap <randy.dunlap@...cle.com>
> 
> Thanks.
> 

Hi Randy,

I just find only select CRC32 is enough, because crc32 code in sequence selects
BITREVERSE in lib/Kconfig. I verified it on my x86_64 machine.

BTW, in mmotm, only fs-reiserfs-return-f_fsid-for-statfs2-v2.patch of the
return-f_fsid-for-statfs2 patch serial which calls crc32_le(). Therefore I will
not update other patches and only merge the modification of fs/reiserfs/Kconfig
to fs-reiserfs-return-f_fsid-for-statfs2-v3.patch. I will Cc you as well.

Thanks.

>> Cc: Andrew Morton <akpm@...ux-foundation.org>
>> ---
>>  fs/reiserfs/Kconfig |    2 ++
>>  1 files changed, 2 insertions(+), 0 deletions(-)
>>
>> diff --git a/fs/reiserfs/Kconfig b/fs/reiserfs/Kconfig
>> index 949b8c6..9712bea 100644
>> --- a/fs/reiserfs/Kconfig
>> +++ b/fs/reiserfs/Kconfig
>> @@ -1,5 +1,7 @@
>>  config REISERFS_FS
>>  	tristate "Reiserfs support"
>> +	select CRC32
>> +	select BITREVERSE
>>  	help
>>  	  Stores not just filenames but the files themselves in a balanced
>>  	  tree.  Uses journalling.
> 
> 

-- 
Coly Li
SuSE Labs
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