gitweb.cgi history not shown

What I do wrong?

$ git-rev-list --all -- gitweb/gitweb.cgi
0a8f4f0020cb35095005852c0797f0b90e9ebb74
$ git-rev-list --all -- gitweb.cgi
$

Also the installed gitweb at kernel.org gives an empty history for
file gitweb.cgi under git repository, while the history is correctly
shown for the same file under the gitweb project.

    Marco