backports: print error for unknown config symbol

When a default configuration is not copied because of a missing
configuration symbol print a warning message.

This Helps to find Configuration symbols which were removed from the
upstream kernel.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

1 files changed, 2 insertions, 0 deletions

diff --git a/gentree.py b/gentree.py
index ae2b1a73..05bb91b3 100755
--- a/gentree.py
+++ b/gentree.py
@@ -1012,6 +1012,8 @@ def process(kerneldir, copy_list_file, git_revision=None,
                     line_ok = True
                     break
             if not line_ok:
+                if args.verbose:
+                    logwrite('can not find "%s" from "%s"\n' % (line.strip(), dfsrc))
                 copy_defconfig = False
                 break
         if copy_defconfig: