linux-kernel - Re: [Ocfs2-devel] [PATCH 1/1] OCFS2: Remove NULL assignments on static

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Message-ID: <534499FA.8010107@oracle.com>
Date:	Wed, 09 Apr 2014 08:53:14 +0800
From:	Wengang <wen.gang.wang@...cle.com>
To:	Fabian Frederick <fabf@...net.be>,
	linux-kernel <linux-kernel@...r.kernel.org>
CC:	ocfs2-devel@....oracle.com
Subject: Re: [Ocfs2-devel] [PATCH 1/1] OCFS2: Remove NULL assignments on static

Hi Fabian,

What's the badness if we do the assignments?

thanks,
wengang

于 2014年04月09日 04:13, Fabian Frederick 写道:
> static values are automatically initialized to NULL.
>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: ocfs2-devel@....oracle.com
> Signed-off-by: Fabian Frederick <fabf@...net.be>
> ---
>   fs/ocfs2/cluster/tcp.c   | 2 +-
>   fs/ocfs2/dlm/dlmdebug.c  | 2 +-
>   fs/ocfs2/dlm/dlmlock.c   | 2 +-
>   fs/ocfs2/dlm/dlmmaster.c | 6 +++---
>   fs/ocfs2/stackglue.c     | 2 +-
>   fs/ocfs2/super.c         | 4 ++--
>   fs/ocfs2/uptodate.c      | 2 +-
>   7 files changed, 10 insertions(+), 10 deletions(-)
>
> diff --git a/fs/ocfs2/cluster/tcp.c b/fs/ocfs2/cluster/tcp.c
> index eb649d2..161fb1e 100644
> --- a/fs/ocfs2/cluster/tcp.c
> +++ b/fs/ocfs2/cluster/tcp.c
> @@ -108,7 +108,7 @@ static struct rb_root o2net_handler_tree = RB_ROOT;
>   static struct o2net_node o2net_nodes[O2NM_MAX_NODES];
>   
>   /* XXX someday we'll need better accounting */
> -static struct socket *o2net_listen_sock = NULL;
> +static struct socket *o2net_listen_sock;
>   
>   /*
>    * listen work is only queued by the listening socket callbacks on the
> diff --git a/fs/ocfs2/dlm/dlmdebug.c b/fs/ocfs2/dlm/dlmdebug.c
> index e33cd7a..18f13c2 100644
> --- a/fs/ocfs2/dlm/dlmdebug.c
> +++ b/fs/ocfs2/dlm/dlmdebug.c
> @@ -338,7 +338,7 @@ void dlm_print_one_mle(struct dlm_master_list_entry *mle)
>   
>   #ifdef CONFIG_DEBUG_FS
>   
> -static struct dentry *dlm_debugfs_root = NULL;
> +static struct dentry *dlm_debugfs_root;
>   
>   #define DLM_DEBUGFS_DIR				"o2dlm"
>   #define DLM_DEBUGFS_DLM_STATE			"dlm_state"
> diff --git a/fs/ocfs2/dlm/dlmlock.c b/fs/ocfs2/dlm/dlmlock.c
> index 5d32f75..66c2a49 100644
> --- a/fs/ocfs2/dlm/dlmlock.c
> +++ b/fs/ocfs2/dlm/dlmlock.c
> @@ -52,7 +52,7 @@
>   #define MLOG_MASK_PREFIX ML_DLM
>   #include "cluster/masklog.h"
>   
> -static struct kmem_cache *dlm_lock_cache = NULL;
> +static struct kmem_cache *dlm_lock_cache;
>   
>   static DEFINE_SPINLOCK(dlm_cookie_lock);
>   static u64 dlm_next_cookie = 1;
> diff --git a/fs/ocfs2/dlm/dlmmaster.c b/fs/ocfs2/dlm/dlmmaster.c
> index af3f7aa..fd07ef9 100644
> --- a/fs/ocfs2/dlm/dlmmaster.c
> +++ b/fs/ocfs2/dlm/dlmmaster.c
> @@ -82,9 +82,9 @@ static inline int dlm_mle_equal(struct dlm_ctxt *dlm,
>   	return 1;
>   }
>   
> -static struct kmem_cache *dlm_lockres_cache = NULL;
> -static struct kmem_cache *dlm_lockname_cache = NULL;
> -static struct kmem_cache *dlm_mle_cache = NULL;
> +static struct kmem_cache *dlm_lockres_cache;
> +static struct kmem_cache *dlm_lockname_cache;
> +static struct kmem_cache *dlm_mle_cache;
>   
>   static void dlm_mle_release(struct kref *kref);
>   static void dlm_init_mle(struct dlm_master_list_entry *mle,
> diff --git a/fs/ocfs2/stackglue.c b/fs/ocfs2/stackglue.c
> index 83f1a66..5d965e8 100644
> --- a/fs/ocfs2/stackglue.c
> +++ b/fs/ocfs2/stackglue.c
> @@ -709,7 +709,7 @@ static struct ctl_table ocfs2_root_table[] = {
>   	{ }
>   };
>   
> -static struct ctl_table_header *ocfs2_table_header = NULL;
> +static struct ctl_table_header *ocfs2_table_header;
>   
>   
>   /*
> diff --git a/fs/ocfs2/super.c b/fs/ocfs2/super.c
> index a7cdd56..9027729 100644
> --- a/fs/ocfs2/super.c
> +++ b/fs/ocfs2/super.c
> @@ -75,7 +75,7 @@
>   
>   #include "buffer_head_io.h"
>   
> -static struct kmem_cache *ocfs2_inode_cachep = NULL;
> +static struct kmem_cache *ocfs2_inode_cachep;
>   struct kmem_cache *ocfs2_dquot_cachep;
>   struct kmem_cache *ocfs2_qf_chunk_cachep;
>   
> @@ -85,7 +85,7 @@ struct kmem_cache *ocfs2_qf_chunk_cachep;
>    * workqueue and schedule on our own. */
>   struct workqueue_struct *ocfs2_wq = NULL;
>   
> -static struct dentry *ocfs2_debugfs_root = NULL;
> +static struct dentry *ocfs2_debugfs_root;
>   
>   MODULE_AUTHOR("Oracle");
>   MODULE_LICENSE("GPL");
> diff --git a/fs/ocfs2/uptodate.c b/fs/ocfs2/uptodate.c
> index 52eaf33..82e17b0 100644
> --- a/fs/ocfs2/uptodate.c
> +++ b/fs/ocfs2/uptodate.c
> @@ -67,7 +67,7 @@ struct ocfs2_meta_cache_item {
>   	sector_t	c_block;
>   };
>   
> -static struct kmem_cache *ocfs2_uptodate_cachep = NULL;
> +static struct kmem_cache *ocfs2_uptodate_cachep;
>   
>   u64 ocfs2_metadata_cache_owner(struct ocfs2_caching_info *ci)
>   {

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