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opal: Use empty structure when not defined

Message ID 1487204187-4004-1-git-send-email-keith.busch@intel.com (mailing list archive)
State New, archived
Headers show

Commit Message

Keith Busch Feb. 16, 2017, 12:16 a.m. UTC
No need to use space if it can't be used. This reduces the size of struct
nvme_ctrl by a little over 4k when CONFIG_BLK_SED_OPAL is not set.

Signed-off-by: Keith Busch <keith.busch@intel.com>
---
 include/linux/sed-opal.h | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

Comments

Scott Bauer Feb. 16, 2017, 2:01 a.m. UTC | #1
On Wed, Feb 15, 2017 at 07:16:27PM -0500, Keith Busch wrote:
> No need to use space if it can't be used. This reduces the size of struct
> nvme_ctrl by a little over 4k when CONFIG_BLK_SED_OPAL is not set.
> 
> Signed-off-by: Keith Busch <keith.busch@intel.com>
> ---
>  include/linux/sed-opal.h | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/include/linux/sed-opal.h b/include/linux/sed-opal.h
> index 205d520..ed19902 100644
> --- a/include/linux/sed-opal.h
> +++ b/include/linux/sed-opal.h
> @@ -91,6 +91,7 @@ struct parsed_resp {
>  	struct opal_resp_tok toks[MAX_TOKS];
>  };
>  
> +#ifdef CONFIG_BLK_SED_OPAL
>  /**
>   * struct opal_dev - The structure representing a OPAL enabled SED.
>   * @supported: Whether or not OPAL is supported on this controller.
> @@ -129,7 +130,6 @@ struct opal_dev {
>  	struct list_head unlk_lst;
>  };
>  
> -#ifdef CONFIG_BLK_SED_OPAL
>  bool opal_unlock_from_suspend(struct opal_dev *dev);
>  void init_opal_dev(struct opal_dev *opal_dev, sec_send_recv *send_recv);
>  int sed_ioctl(struct opal_dev *dev, unsigned int cmd, void __user *ioctl_ptr);
> @@ -154,6 +154,9 @@ static inline bool is_sed_ioctl(unsigned int cmd)
>  	return false;
>  }
>  #else
> +struct opal_dev {
> +};
> +
>  static inline bool is_sed_ioctl(unsigned int cmd)
>  {
>  	return false;
> @@ -171,8 +174,6 @@ static inline bool opal_unlock_from_suspend(struct opal_dev *dev)
>  static inline void init_opal_dev(struct opal_dev *opal_dev,
>  				 sec_send_recv *send_recv)
>  {
> -	opal_dev->supported = false;
> -	opal_dev->initialized = true;
>  }
>  #endif /* CONFIG_BLK_SED_OPAL */
>  #endif /* LINUX_OPAL_H */
> -- 
> 2.5.5
> 

Looks good, thank you.
Reviewed-by: Scott Bauer <scott.bauer@intel.com>
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Patch

diff --git a/include/linux/sed-opal.h b/include/linux/sed-opal.h
index 205d520..ed19902 100644
--- a/include/linux/sed-opal.h
+++ b/include/linux/sed-opal.h
@@ -91,6 +91,7 @@  struct parsed_resp {
 	struct opal_resp_tok toks[MAX_TOKS];
 };
 
+#ifdef CONFIG_BLK_SED_OPAL
 /**
  * struct opal_dev - The structure representing a OPAL enabled SED.
  * @supported: Whether or not OPAL is supported on this controller.
@@ -129,7 +130,6 @@  struct opal_dev {
 	struct list_head unlk_lst;
 };
 
-#ifdef CONFIG_BLK_SED_OPAL
 bool opal_unlock_from_suspend(struct opal_dev *dev);
 void init_opal_dev(struct opal_dev *opal_dev, sec_send_recv *send_recv);
 int sed_ioctl(struct opal_dev *dev, unsigned int cmd, void __user *ioctl_ptr);
@@ -154,6 +154,9 @@  static inline bool is_sed_ioctl(unsigned int cmd)
 	return false;
 }
 #else
+struct opal_dev {
+};
+
 static inline bool is_sed_ioctl(unsigned int cmd)
 {
 	return false;
@@ -171,8 +174,6 @@  static inline bool opal_unlock_from_suspend(struct opal_dev *dev)
 static inline void init_opal_dev(struct opal_dev *opal_dev,
 				 sec_send_recv *send_recv)
 {
-	opal_dev->supported = false;
-	opal_dev->initialized = true;
 }
 #endif /* CONFIG_BLK_SED_OPAL */
 #endif /* LINUX_OPAL_H */