nvme: common: make keyring and auth separate modules

When only the keyring module is included but auth is not, modpost
complains about the lack of a module license tag:

ERROR: modpost: missing MODULE_LICENSE() in drivers/nvme/common/nvme-common.o

Address this by making both modules buildable standalone,
removing the now unnecessary CONFIG_NVME_COMMON symbol
in the process.

Also, now that NVME_KEYRING config symbol can be either a module or
built-in, the stubs need to check for '#if IS_ENABLED' rather than a
simple '#ifdef'.

Fixes: 9d77eb5277849 ("nvme-keyring: register '.nvme' keyring")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Keith Busch <kbusch@kernel.org>

6 files changed, 9 insertions, 13 deletions

diff --git a/drivers/nvme/Makefile b/drivers/nvme/Makefile
index eedca8c72098..74f59ceed3d5 100644
--- a/drivers/nvme/Makefile
+++ b/drivers/nvme/Makefile
@@ -1,5 +1,5 @@
 # SPDX-License-Identifier: GPL-2.0-only
 
-obj-$(CONFIG_NVME_COMMON)		+= common/
+obj-y		+= common/
 obj-y		+= host/
 obj-y		+= target/
diff --git a/drivers/nvme/common/Kconfig b/drivers/nvme/common/Kconfig
index 06c8df00d1e2..244432e0b73d 100644
--- a/drivers/nvme/common/Kconfig
+++ b/drivers/nvme/common/Kconfig
@@ -1,14 +1,11 @@
 # SPDX-License-Identifier: GPL-2.0-only
 
-config NVME_COMMON
-       tristate
-
 config NVME_KEYRING
-       bool
+       tristate
        select KEYS
 
 config NVME_AUTH
-	bool
+	tristate
 	select CRYPTO
 	select CRYPTO_HMAC
 	select CRYPTO_SHA256
diff --git a/drivers/nvme/common/Makefile b/drivers/nvme/common/Makefile
index 0cbd0b0b8d49..681514cf2e2f 100644
--- a/drivers/nvme/common/Makefile
+++ b/drivers/nvme/common/Makefile
@@ -2,7 +2,8 @@
 
 ccflags-y			+= -I$(src)
 
-obj-$(CONFIG_NVME_COMMON)	+= nvme-common.o
+obj-$(CONFIG_NVME_AUTH)		+= nvme-auth.o
+obj-$(CONFIG_NVME_KEYRING)	+= nvme-keyring.o
 
-nvme-common-$(CONFIG_NVME_AUTH)	+= auth.o
-nvme-common-$(CONFIG_NVME_KEYRING) += keyring.o
+nvme-auth-y			+= auth.o
+nvme-keyring-y			+= keyring.o
diff --git a/drivers/nvme/common/keyring.c b/drivers/nvme/common/keyring.c
index f8d9a208397b..46d7a537dbc2 100644
--- a/drivers/nvme/common/keyring.c
+++ b/drivers/nvme/common/keyring.c
@@ -180,3 +180,5 @@ void nvme_keyring_exit(void)
 	key_put(nvme_keyring);
 }
 EXPORT_SYMBOL_GPL(nvme_keyring_exit);
+
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/nvme/host/Kconfig b/drivers/nvme/host/Kconfig
index 48f7d72de5e9..8fe2dd619e80 100644
--- a/drivers/nvme/host/Kconfig
+++ b/drivers/nvme/host/Kconfig
@@ -95,7 +95,6 @@ config NVME_TCP
 config NVME_TCP_TLS
 	bool "NVMe over Fabrics TCP TLS encryption support"
 	depends on NVME_TCP
-	select NVME_COMMON
 	select NVME_KEYRING
 	select NET_HANDSHAKE
 	select KEYS
@@ -110,7 +109,6 @@ config NVME_TCP_TLS
 config NVME_HOST_AUTH
 	bool "NVM Express over Fabrics In-Band Authentication"
 	depends on NVME_CORE
-	select NVME_COMMON
 	select NVME_AUTH
 	help
 	  This provides support for NVMe over Fabrics In-Band Authentication.
diff --git a/drivers/nvme/target/Kconfig b/drivers/nvme/target/Kconfig
index fa479c9f5c3d..31633da9427c 100644
--- a/drivers/nvme/target/Kconfig
+++ b/drivers/nvme/target/Kconfig
@@ -87,7 +87,6 @@ config NVME_TARGET_TCP
 config NVME_TARGET_TCP_TLS
 	bool "NVMe over Fabrics TCP target TLS encryption support"
 	depends on NVME_TARGET_TCP
-	select NVME_COMMON
 	select NVME_KEYRING
 	select NET_HANDSHAKE
 	select KEYS
@@ -102,7 +101,6 @@ config NVME_TARGET_TCP_TLS
 config NVME_TARGET_AUTH
 	bool "NVMe over Fabrics In-band Authentication support"
 	depends on NVME_TARGET
-	select NVME_COMMON
 	select NVME_AUTH
 	help
 	  This enables support for NVMe over Fabrics In-band Authentication