Commit 55abb0929e removed the never
used format1 argument of spl_debug_msg(). That in turn resulted
in some deadcode which should be removed since it's now useless.
The Solaris Porting Layer (SPL) is a Linux kernel module which provides
many of the Solaris kernel APIs. This shim layer makes it possible to
run Solaris kernel code in the Linux kernel with relatively minimal
modification. This can be particularly useful when you want to track
upstream Solaris development closely and don’t want the overhead of
maintaining a large patch which converts Solaris primitives to Linux
primitives.
8b0eb3f0dc