[PATCH] kbuild: document the KBUILD_KCONFIG env. variable

[Randy Dunlap]

From: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>

Add usage info for the Kbuild environment variable KBUILD_KCONFIG.

Signed-off-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
---
 Documentation/kbuild/kbuild.txt |    5 +++++
 1 file changed, 5 insertions(+)

--- lnx-418-rc3.orig/Documentation/kbuild/kbuild.txt
+++ lnx-418-rc3/Documentation/kbuild/kbuild.txt
@@ -50,6 +50,11 @@ LDFLAGS_MODULE
 --------------------------------------------------
 Additional options used for $(LD) when linking modules.
 
+KBUILD_KCONFIG
+--------------------------------------------------
+Set the top-level Kconfig file to the value of this environment
+variable.  The default name is "Kconfig".
+
 KBUILD_VERBOSE
 --------------------------------------------------
 Set the kbuild verbosity. Can be assigned same values as "V=...".