Re: [RFC PATCH -V3 9/9] ext4: Fix lockdep recursive locking warning

[Li Zefan <lizf@cn.fujitsu.com>]

I got compile error on IA64:

fs/ext4/mballoc.c: In function ‘ext4_mb_add_groupinfo’:
fs/ext4/mballoc.c:2482: error: implicit declaration of function ‘__init_rwsem’


Aneesh Kumar K.V wrote:
> Indicate that the group locks can be taken in loop.
> 
> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
> ---
>  fs/ext4/mballoc.c |    5 ++++-
>  1 files changed, 4 insertions(+), 1 deletions(-)
> 
> diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
> index f58de20..34b9b7c 100644
> --- a/fs/ext4/mballoc.c
> +++ b/fs/ext4/mballoc.c
> @@ -2413,6 +2413,7 @@ ext4_mb_store_history(struct ext4_allocation_context *ac)
>  #define ext4_mb_history_init(sb)
>  #endif
>  
> +static struct lock_class_key alloc_sem_key[NR_BG_LOCKS];
>  
>  /* Create and initialize ext4_group_info data for the given group. */
>  int ext4_mb_add_groupinfo(struct super_block *sb, ext4_group_t group,
> @@ -2473,7 +2474,9 @@ int ext4_mb_add_groupinfo(struct super_block *sb, ext4_group_t group,
>  	}
>  
>  	INIT_LIST_HEAD(&meta_group_info[i]->bb_prealloc_list);
> -	init_rwsem(&meta_group_info[i]->alloc_sem);
> +	__init_rwsem(&meta_group_info[i]->alloc_sem,
> +			"&meta_group_info[i]->alloc_sem",
> +			&alloc_sem_key[i]);
>  	meta_group_info[i]->bb_free_root.rb_node = NULL;;
>  
>  #ifdef DOUBLE_CHECK
--
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