It might not be immediately obvious to users that they
have specified an incorrect kernel version. So throw
a more helpful error message explaining where to find
the appropriate documentation on kernel version
specification.

Signed-off-by: Lucas Meneghel Rodrigues <[email protected]>
---
 client/kernelexpand.py |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/client/kernelexpand.py b/client/kernelexpand.py
index 18c766d..2e73067 100755
--- a/client/kernelexpand.py
+++ b/client/kernelexpand.py
@@ -217,7 +217,10 @@ def decompose_kernel(kernel):
         if patch_list:
             kernel_patches.insert(0, patch_list)
     if not len(kernel_patches):
-        raise NameError('Unknown kernel: %s' % kernel)
+        doc_url = 
'https://github.com/autotest/autotest/wiki/KernelSpecification'
+        raise NameError("Kernel '%s' not found. "
+                        "Check %s for kernel spec docs." %
+                        (kernel, doc_url))
 
     return kernel_patches
 
-- 
1.7.10.4

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