[PATCH] lightnvm: Simplify config when disabled

[Matias Bjørling]

On 11/23/2015 07:55 PM, Keith Busch wrote:
> We shouldn't compile an object file to get empty implementations; conforms
> to linux coding style on conditional compilation.
>
> Signed-off-by: Keith Busch <keith.busch at intel.com>
> ---
>   drivers/nvme/host/Makefile   |  3 ++-
>   drivers/nvme/host/lightnvm.c | 13 -------------
>   drivers/nvme/host/nvme.h     | 14 ++++++++++++++
>   3 files changed, 16 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/nvme/host/Makefile b/drivers/nvme/host/Makefile
> index 219dc206..a5fe239 100644
> --- a/drivers/nvme/host/Makefile
> +++ b/drivers/nvme/host/Makefile
> @@ -1,4 +1,5 @@
>
>   obj-$(CONFIG_BLK_DEV_NVME)     += nvme.o
>
> -nvme-y		+= pci.o scsi.o lightnvm.o
> +lightnvm-$(CONFIG_NVM)	:= lightnvm.o
> +nvme-y		+= pci.o scsi.o $(lightnvm-y)
> diff --git a/drivers/nvme/host/lightnvm.c b/drivers/nvme/host/lightnvm.c
> index 9202d1a..07451d6 100644
> --- a/drivers/nvme/host/lightnvm.c
> +++ b/drivers/nvme/host/lightnvm.c
> @@ -22,8 +22,6 @@
>
>   #include "nvme.h"
>
> -#ifdef CONFIG_NVM
> -
>   #include <linux/nvme.h>
>   #include <linux/bitops.h>
>   #include <linux/lightnvm.h>
> @@ -588,14 +586,3 @@ int nvme_nvm_ns_supported(struct nvme_ns *ns, struct nvme_id_ns *id)
>
>   	return 0;
>   }
> -#else
> -int nvme_nvm_register(struct request_queue *q, char *disk_name)
> -{
> -	return 0;
> -}
> -void nvme_nvm_unregister(struct request_queue *q, char *disk_name) {};
> -int nvme_nvm_ns_supported(struct nvme_ns *ns, struct nvme_id_ns *id)
> -{
> -	return 0;
> -}
> -#endif /* CONFIG_NVM */
> diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
> index fdb4e5b..044253d 100644
> --- a/drivers/nvme/host/nvme.h
> +++ b/drivers/nvme/host/nvme.h
> @@ -136,8 +136,22 @@ int nvme_sg_io(struct nvme_ns *ns, struct sg_io_hdr __user *u_hdr);
>   int nvme_sg_io32(struct nvme_ns *ns, unsigned long arg);
>   int nvme_sg_get_version_num(int __user *ip);
>
> +#ifdef CONFIG_NVM
>   int nvme_nvm_ns_supported(struct nvme_ns *ns, struct nvme_id_ns *id);
>   int nvme_nvm_register(struct request_queue *q, char *disk_name);
>   void nvme_nvm_unregister(struct request_queue *q, char *disk_name);
> +#else
> +static inline int nvme_nvm_register(struct request_queue *q, char *disk_name)
> +{
> +	return 0;
> +}
> +
> +static inline void nvme_nvm_unregister(struct request_queue *q, char *disk_name) {};
> +
> +static inline int nvme_nvm_ns_supported(struct nvme_ns *ns, struct nvme_id_ns *id)
> +{
> +	return 0;
> +}
> +#endif /* CONFIG_NVM */
>
>   #endif /* _NVME_H */
>

Thanks Keith.

Reviewed-by: Matias Bjørling <m at bjorling.me>