X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=Documentation%2Fkbuild%2Fmodules.txt;h=1821c077b435cd64eac847dc1ec69d5386dc6ad6;hb=886c35fbcf6fb2eee15687efc2d64d99b6ad9a4a;hp=769ee05ee4d1f6da279386c2325ff5f80e322570;hpb=b4a9071af62f95dc6d22040a0b37ac7225ce4d54;p=linux-2.6

diff --git a/Documentation/kbuild/modules.txt b/Documentation/kbuild/modules.txt
index 769ee05ee4..1821c077b4 100644
--- a/Documentation/kbuild/modules.txt
+++ b/Documentation/kbuild/modules.txt
@@ -249,7 +249,7 @@ following files:
 		--> filename: Makefile
 		KERNELDIR := /lib/modules/`uname -r`/build
 		all::
-			$(MAKE) -C $KERNELDIR M=`pwd` $@
+			$(MAKE) -C $(KERNELDIR) M=`pwd` $@
 
 		# Module specific targets
 		genbin:
@@ -486,7 +486,7 @@ Module.symvers contains a list of all exported symbols from a kernel build.
 	Sometimes, an external module uses exported symbols from another
 	external module. Kbuild needs to have full knowledge on all symbols
 	to avoid spitting out warnings about undefined symbols.
-	Two solutions exist to let kbuild know all symbols of more than
+	Three solutions exist to let kbuild know all symbols of more than
 	one external module.
 	The method with a top-level kbuild file is recommended but may be
 	impractical in certain situations.
@@ -523,6 +523,13 @@ Module.symvers contains a list of all exported symbols from a kernel build.
 		containing the sum of all symbols defined and not part of the
 		kernel.
 
+	Use make variable KBUILD_EXTRA_SYMBOLS in the Makefile
+		If it is impractical to copy Module.symvers from another
+		module, you can assign a space separated list of files to
+		KBUILD_EXTRA_SYMBOLS in your Makfile. These files will be
+		loaded by modpost during the initialisation of its symbol
+		tables.
+
 === 8. Tips & Tricks
 
 --- 8.1 Testing for CONFIG_FOO_BAR