[CRYPTO] api: Make the crypto subsystem fully modular

Signed-off-by: Sebastian Siewior <sebastian@breakpoint.cc>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

crypto/Kconfig

@@ -13,7 +13,7 @@ source "crypto/async_tx/Kconfig"
 # Cryptographic API Configuration
 #
 menuconfig CRYPTO
-	bool "Cryptographic API"
+	tristate "Cryptographic API"
 	help
 	  This option provides the core Cryptographic API.
 

crypto/Makefile

@@ -2,7 +2,8 @@
 # Cryptographic API
 #
 
-obj-$(CONFIG_CRYPTO) += api.o cipher.o digest.o compress.o
+obj-$(CONFIG_CRYPTO) += crypto.o
+crypto-objs := api.o cipher.o digest.o compress.o
 
 crypto_algapi-$(CONFIG_PROC_FS) += proc.o
 crypto_algapi-objs := algapi.o scatterwalk.o $(crypto_algapi-y)

crypto/api.c

@@ -445,3 +445,6 @@ int crypto_has_alg(const char *name, u32 type, u32 mask)
 	return ret;
 }
 EXPORT_SYMBOL_GPL(crypto_has_alg);
+
+MODULE_DESCRIPTION("Cryptographic core API");
+MODULE_LICENSE("GPL");

include/linux/crypto.h

@@ -317,14 +317,7 @@ int crypto_unregister_alg(struct crypto_alg *alg);
 /*
  * Algorithm query interface.
  */
-#ifdef CONFIG_CRYPTO
 int crypto_has_alg(const char *name, u32 type, u32 mask);
-#else
-static inline int crypto_has_alg(const char *name, u32 type, u32 mask)
-{
-	return 0;
-}
-#endif
 
 /*
  * Transforms: user-instantiated objects which encapsulate algorithms