Re: git log -- <old path> not working

Ville Syrjälä [off-list ref] writes:

$ git log -- drivers/acpi/configfs.c
-> nothing

$ git log --follow -- drivers/acpi/configfs.c
$ git log --full-history -- drivers/acpi/configfs.c
-> works

First time I've seen this fail. Expected behaviour for
some reason, or a bug?

Expected.  

In a history is branchy and mergy,

    ---O---o---o---o---o---M---x
        \                 /
         o---A---o---B---o

where A, B and possibly M made changes to PATH,

    $ git log X -- PATH

may show nothing if the PATH at O and M are identical.  This is
described in "History Simplification" section of "git log --help"