Makefile: Documentation for external tool should be correct

From: "H. Peter Anvin" <[email protected]>

If one includes documentation for an external tool, it should be correct. This is not:

1. Overriding the input to rngd should typically be neither necessary nor desired. This is especially so since newer versions of rngd support a number of different *types* of sources.
2. The default kernel-exported device is called /dev/hwrng not /dev/hwrandom nor /dev/hw_random (both of which were used in the past; however, kernel and udev seem to have converged on /dev/hwrng.)

Overall it is better if the documentation for rngd is kept with rngd rather than in a kernel Makefile.

---
 kernel/Makefile |    6 ++----
 1 files changed, 2 insertions(+), 4 deletions(-)

index 0dfeca4..86e3285 100644
@@ -174,10 +174,8 @@ signing_key.priv signing_key.x509: x509.genkey
 	@echo "###"
 	@echo "### If this takes a long time, you might wish to run rngd in the"
 	@echo "### background to keep the supply of entropy topped up.  It"
-	@echo "### needs to be run as root, and should use a hardware random"
-	@echo "### number generator if one is available, eg:"
-	@echo "###"
-	@echo "###     rngd -r /dev/hwrandom"
+	@echo "### needs to be run as root, and uses a hardware random"
+	@echo "### number generator if one is available."
 	@echo "###"
 	openssl req -new -nodes -utf8 $(sign_key_with_hash) -days 36500 -batch \
 		-x509 -config x509.genkey \

1.7.6.5