[Ocfs2-devel] [PATCH] ocfs2: Fix 2 warning during ocfs2 make.

[Wengang Wang <wen.gang.wang@oracle.com>]

while, the slot is type of u32 in for functions...

Wengang Wang wrote:
> Hi Tao,
> 
> I think for the OCFS2_INVALID_SLOT problem,
> define OCFS2_INVALID_SLOT as (u16)-1 is better. so that we needn't
> force convert type wherever it's used.
> 
> 
> --- fs/ocfs2/ocfs2_fs.h 2009-02-18 19:58:02.000000000 +0800
> +++ fs/ocfs2/ocfs2_fs.h.1       2009-03-19 14:24:18.000000000 +0800
> @@ -303,7 +303,7 @@ struct ocfs2_new_group_input {
>   #define OCFS2_MAX_SLOTS                        255
> 
>   /* Slot map indicator for an empty slot */
> -#define OCFS2_INVALID_SLOT             -1
> +#define OCFS2_INVALID_SLOT             (u16)-1
> 
>   #define OCFS2_VOL_UUID_LEN             16
>   #define OCFS2_MAX_VOL_LABEL_LEN                64
> 
> I didn't paste the part for removing force type converting.
> 
> thanks,
> wengang.
> 
> Tao Ma wrote:
>> fs/ocfs2/dir.c: In function ?ocfs2_extend_dir?:
>> fs/ocfs2/dir.c:2700: warning: ?ret? may be used uninitialized in this function
>>
>> fs/ocfs2/suballoc.c: In function ?ocfs2_get_suballoc_slot_bit?:
>> fs/ocfs2/suballoc.c:2216: warning: comparison is always true due to limited range of data type
>>
>> Signed-off-by: Tao Ma <tao.ma@oracle.com>
>> ---
>>  fs/ocfs2/dir.c      |    2 +-
>>  fs/ocfs2/suballoc.c |    2 +-
>>  2 files changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/fs/ocfs2/dir.c b/fs/ocfs2/dir.c
>> index e71160c..eeac241 100644
>> --- a/fs/ocfs2/dir.c
>> +++ b/fs/ocfs2/dir.c
>> @@ -2697,7 +2697,7 @@ static int ocfs2_dx_dir_index_block(struct inode *dir,
>>  				    u32 *num_dx_entries,
>>  				    struct buffer_head *dirent_bh)
>>  {
>> -	int ret, namelen, i;
>> +	int ret = 0, namelen, i;
>>  	char *de_buf, *limit;
>>  	struct ocfs2_dir_entry *de;
>>  	struct buffer_head *dx_leaf_bh;
>> diff --git a/fs/ocfs2/suballoc.c b/fs/ocfs2/suballoc.c
>> index b4ca591..eb21dbb 100644
>> --- a/fs/ocfs2/suballoc.c
>> +++ b/fs/ocfs2/suballoc.c
>> @@ -2213,7 +2213,7 @@ static int ocfs2_get_suballoc_slot_bit(struct ocfs2_super *osb, u64 blkno,
>>  		goto bail;
>>  	}
>>  
>> -	if (le16_to_cpu(inode_fe->i_suballoc_slot) != OCFS2_INVALID_SLOT &&
>> +	if (le16_to_cpu(inode_fe->i_suballoc_slot) != (u16)OCFS2_INVALID_SLOT &&
>>  	    (u32)le16_to_cpu(inode_fe->i_suballoc_slot) > osb->max_slots - 1) {
>>  		mlog(ML_ERROR, "inode %llu has invalid suballoc slot %u\n",
>>  		     blkno, (u32)le16_to_cpu(inode_fe->i_suballoc_slot));
> 
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