See upstream commit:
commit
1d2e7c7c3ed73cc510a4dc093df2a935092ff5ad
Author: David Sterba <dsterba@suse.com>
Date: Thu Oct 17 13:28:57 2019 +0200
btrfs: tracepoints: constify all pointers
We don't modify the data passed to tracepoints, some of the declarations
are already const, add it to the rest.
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>