[PATCH] linux-next 20190731 - aegis128-core.c fails to build

["Valdis Klētnieks" <valdis.kletnieks@vt.edu>]

The recent NEON SIMD patches break the build if CONFIG_CRYPTO_AEGIS128_SIMD isn't set:

  MODPOST 558 modules
ERROR: "crypto_aegis128_decrypt_chunk_simd" [crypto/aegis128.ko] undefined!
ERROR: "crypto_aegis128_update_simd" [crypto/aegis128.ko] undefined!
ERROR: "crypto_aegis128_encrypt_chunk_simd" [crypto/aegis128.ko] undefined!
make[1]: *** [scripts/Makefile.modpost:105: modules-modpost] Error 1
make: *** [Makefile:1299: modules] Error 2

Add proper definitions and stubs to aegis.h so it builds both ways. This
necessitated moving other stuff from aegis128-core.c to aegis.h so things were
defined in the proper order.

Signed-off-by: Valdis Kletnieks <valdis.kletnieks@vt.edu>
---
diff --git a/crypto/aegis.h b/crypto/aegis.h
index 4d56a85aea49..50a7496ca4ae 100644
--- a/crypto/aegis.h
+++ b/crypto/aegis.h
@@ -13,6 +13,11 @@
 #include <linux/bitops.h>
 #include <linux/types.h>
 
+#define AEGIS128_NONCE_SIZE 16
+#define AEGIS128_STATE_BLOCKS 5
+#define AEGIS128_KEY_SIZE 16
+#define AEGIS128_MIN_AUTH_SIZE 8
+#define AEGIS128_MAX_AUTH_SIZE 16
 #define AEGIS_BLOCK_SIZE 16
 
 union aegis_block {
@@ -21,6 +26,39 @@ union aegis_block {
 	u8 bytes[AEGIS_BLOCK_SIZE];
 };
 
+struct aegis_state {
+	union aegis_block blocks[AEGIS128_STATE_BLOCKS];
+};
+
+struct aegis_ctx {
+	union aegis_block key;
+};
+
+struct aegis128_ops {
+	int (*skcipher_walk_init)(struct skcipher_walk *walk,
+				  struct aead_request *req, bool atomic);
+
+	void (*crypt_chunk)(struct aegis_state *state, u8 *dst,
+			    const u8 *src, unsigned int size);
+};
+
+
+#ifdef CONFIG_CRYPTO_AEGIS128_SIMD
+bool crypto_aegis128_have_simd(void);
+void crypto_aegis128_update_simd(struct aegis_state *state, const void *msg);
+void crypto_aegis128_encrypt_chunk_simd(struct aegis_state *state, u8 *dst,
+					const u8 *src, unsigned int size);
+void crypto_aegis128_decrypt_chunk_simd(struct aegis_state *state, u8 *dst,
+					const u8 *src, unsigned int size);
+#else
+static inline bool crypto_aegis128_have_simd(void) { return false; }
+static inline void crypto_aegis128_update_simd(struct aegis_state *state, const void *msg) { }
+static inline void crypto_aegis128_encrypt_chunk_simd(struct aegis_state *state, u8 *dst,
+					const u8 *src, unsigned int size) { }
+static inline void crypto_aegis128_decrypt_chunk_simd(struct aegis_state *state, u8 *dst,
+					const u8 *src, unsigned int size) { }
+#endif
+
 #define AEGIS_BLOCK_ALIGN (__alignof__(union aegis_block))
 #define AEGIS_ALIGNED(p) IS_ALIGNED((uintptr_t)p, AEGIS_BLOCK_ALIGN)
 
diff --git a/crypto/aegis128-core.c b/crypto/aegis128-core.c
index f815b4685156..8b738128a921 100644
--- a/crypto/aegis128-core.c
+++ b/crypto/aegis128-core.c
@@ -20,37 +20,8 @@
 
 #include "aegis.h"
 
-#define AEGIS128_NONCE_SIZE 16
-#define AEGIS128_STATE_BLOCKS 5
-#define AEGIS128_KEY_SIZE 16
-#define AEGIS128_MIN_AUTH_SIZE 8
-#define AEGIS128_MAX_AUTH_SIZE 16
-
-struct aegis_state {
-	union aegis_block blocks[AEGIS128_STATE_BLOCKS];
-};
-
-struct aegis_ctx {
-	union aegis_block key;
-};
-
-struct aegis128_ops {
-	int (*skcipher_walk_init)(struct skcipher_walk *walk,
-				  struct aead_request *req, bool atomic);
-
-	void (*crypt_chunk)(struct aegis_state *state, u8 *dst,
-			    const u8 *src, unsigned int size);
-};
-
 static bool have_simd;
 
-bool crypto_aegis128_have_simd(void);
-void crypto_aegis128_update_simd(struct aegis_state *state, const void *msg);
-void crypto_aegis128_encrypt_chunk_simd(struct aegis_state *state, u8 *dst,
-					const u8 *src, unsigned int size);
-void crypto_aegis128_decrypt_chunk_simd(struct aegis_state *state, u8 *dst,
-					const u8 *src, unsigned int size);
-
 static void crypto_aegis128_update(struct aegis_state *state)
 {
 	union aegis_block tmp;