lib: digital signature config option name change

It was reported that DIGSIG is confusing name for digital signature
module. It was suggested to rename DIGSIG to SIGNATURE.

Requested-by: Linus Torvalds <torvalds@linux-foundation.org>
Suggested-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Dmitry Kasatkin <dmitry.kasatkin@intel.com>
Signed-off-by: James Morris <jmorris@namei.org>
diff --git a/include/linux/digsig.h b/include/linux/digsig.h
index efae755..b01558b 100644
--- a/include/linux/digsig.h
+++ b/include/linux/digsig.h
@@ -46,7 +46,7 @@
 	char		mpi[0];
 } __packed;
 
-#if defined(CONFIG_DIGSIG) || defined(CONFIG_DIGSIG_MODULE)
+#if defined(CONFIG_SIGNATURE) || defined(CONFIG_SIGNATURE_MODULE)
 
 int digsig_verify(struct key *keyring, const char *sig, int siglen,
 					const char *digest, int digestlen);
@@ -59,6 +59,6 @@
 	return -EOPNOTSUPP;
 }
 
-#endif /* CONFIG_DIGSIG */
+#endif /* CONFIG_SIGNATURE */
 
 #endif /* _DIGSIG_H */
diff --git a/lib/Kconfig b/lib/Kconfig
index 201e1b3..854735d 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -302,7 +302,7 @@
 	  This code in unnecessary for RSA digital signature verification,
 	  and can be compiled if needed.
 
-config DIGSIG
+config SIGNATURE
 	tristate "In-kernel signature checker"
 	depends on KEYS
 	select MPILIB
diff --git a/lib/Makefile b/lib/Makefile
index dace162..d71aae1 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -119,7 +119,7 @@
 obj-$(CONFIG_DQL) += dynamic_queue_limits.o
 
 obj-$(CONFIG_MPILIB) += mpi/
-obj-$(CONFIG_DIGSIG) += digsig.o
+obj-$(CONFIG_SIGNATURE) += digsig.o
 
 hostprogs-y	:= gen_crc32table
 clean-files	:= crc32table.h
diff --git a/security/integrity/Kconfig b/security/integrity/Kconfig
index d384ea9..ff60bf7 100644
--- a/security/integrity/Kconfig
+++ b/security/integrity/Kconfig
@@ -7,7 +7,7 @@
 	boolean "Digital signature verification using multiple keyrings"
 	depends on INTEGRITY && KEYS
 	default n
-	select DIGSIG
+	select SIGNATURE
 	help
 	  This option enables digital signature verification support
 	  using multiple keyrings. It defines separate keyrings for each