linux-kernel - Re: [patch] [SCSI] target: dubious one-bit signed bitfield

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Date:	Sat, 15 Jan 2011 12:53:57 -0800
From:	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>
To:	Dan Carpenter <error27@...il.com>
Cc:	James Bottomley <James.Bottomley@...e.de>,
	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: Re: [patch] [SCSI] target: dubious one-bit signed bitfield

On Sat, 2011-01-15 at 17:04 +0300, Dan Carpenter wrote:
> The signed one-bit types can be 0 or -1 which can cause a problem if
> someone ever checks if (foo->lu_gp_assoc == 1).  The current code is
> fine because everyone just checks zero vs non-zero.  But Sparse
> complains about it so lets change it.  The warnings look like this:
> 
> include/target/target_core_base.h:228:26: error: dubious one-bit signed bitfield
> 
> Signed-off-by: Dan Carpenter <error27@...il.com>

Looks reasonable to me..  Committed as daf0bd7aa57e in
lio-core-2.6.git/linus-38-rc1 and cherry picked into
scsi-post-merge-2.6.git/for-jejb.

Thanks Dan!

--nab

> 
> diff --git a/include/target/target_core_base.h b/include/target/target_core_base.h
> index 07fdfb6..764177b 100644
> --- a/include/target/target_core_base.h
> +++ b/include/target/target_core_base.h
> @@ -225,7 +225,7 @@ struct t10_alua_lu_gp {
>  } ____cacheline_aligned;
>  
>  struct t10_alua_lu_gp_member {
> -	int lu_gp_assoc:1;
> +	bool lu_gp_assoc;
>  	atomic_t lu_gp_mem_ref_cnt;
>  	spinlock_t lu_gp_mem_lock;
>  	struct t10_alua_lu_gp *lu_gp;
> @@ -257,7 +257,7 @@ struct t10_alua_tg_pt_gp {
>  } ____cacheline_aligned;
>  
>  struct t10_alua_tg_pt_gp_member {
> -	int tg_pt_gp_assoc:1;
> +	bool tg_pt_gp_assoc;
>  	atomic_t tg_pt_gp_mem_ref_cnt;
>  	spinlock_t tg_pt_gp_mem_lock;
>  	struct t10_alua_tg_pt_gp *tg_pt_gp;
> @@ -322,7 +322,7 @@ struct t10_pr_registration {
>  	int pr_res_type;
>  	int pr_res_scope;
>  	/* Used for fabric initiator WWPNs using a ISID */
> -	int isid_present_at_reg:1;
> +	bool isid_present_at_reg;
>  	u32 pr_res_mapped_lun;
>  	u32 pr_aptpl_target_lun;
>  	u32 pr_res_generation;
> @@ -404,7 +404,7 @@ struct se_transport_task {
>  	unsigned long long	t_task_lba;
>  	int			t_tasks_failed;
>  	int			t_tasks_fua;
> -	int			t_tasks_bidi:1;
> +	bool			t_tasks_bidi;
>  	u32			t_task_cdbs;
>  	u32			t_tasks_check;
>  	u32			t_tasks_no;
> @@ -456,7 +456,7 @@ struct se_task {
>  	u8		task_flags;
>  	int		task_error_status;
>  	int		task_state_flags;
> -	int		task_padded_sg:1;
> +	bool		task_padded_sg;
>  	unsigned long long	task_lba;
>  	u32		task_no;
>  	u32		task_sectors;
> @@ -569,7 +569,7 @@ struct se_ua {
>  struct se_node_acl {
>  	char			initiatorname[TRANSPORT_IQN_LEN];
>  	/* Used to signal demo mode created ACL, disabled by default */
> -	int			dynamic_node_acl:1;
> +	bool			dynamic_node_acl;
>  	u32			queue_depth;
>  	u32			acl_index;
>  	u64			num_cmds;
> @@ -622,7 +622,7 @@ struct se_lun_acl {
>  }  ____cacheline_aligned;
>  
>  struct se_dev_entry {
> -	int			def_pr_registered:1;
> +	bool			def_pr_registered;
>  	/* See transport_lunflags_table */
>  	u32			lun_flags;
>  	u32			deve_cmds;
> diff --git a/include/target/target_core_fabric_ops.h b/include/target/target_core_fabric_ops.h
> index f3ac12b..5eb8b1a 100644
> --- a/include/target/target_core_fabric_ops.h
> +++ b/include/target/target_core_fabric_ops.h
> @@ -8,7 +8,7 @@ struct target_core_fabric_ops {
>  	 * for scatterlist chaining using transport_do_task_sg_link(),
>  	 * disabled by default
>  	 */
> -	int task_sg_chaining:1;
> +	bool task_sg_chaining;
>  	char *(*get_fabric_name)(void);
>  	u8 (*get_fabric_proto_ident)(struct se_portal_group *);
>  	char *(*tpg_get_wwn)(struct se_portal_group *);

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