Hi, I was the person who reported Bug 92518 and I switched to Fedora 23 to try
and compile drm, xf86-video-ati, and mesa from the git master.

I am assuming the "Tahiti fix v2" patch is for mesa, but I have no idea how to
apply the patch. After some googling, I guess I am supposed to use:
git-apply --directory=<path to file of interest>

The problem is that in the patch, I am supposed to look for a path to the file
called a/drivers/gpu/drm/radeon/si.c, but that file si.c does not exist in the
mesa tree when I ran the command:
find <mesa source folder> si.c

I need some help with this so that I can test the patch.