README.gdev:patch -p1 < $(TOPDIR)/gdev/mod/linux/patches/gdev-nouveau-X.X.patch problem

[HATEM-ELAZAB]

in the 3rd step in README.gdev file ,i am trying to execute the patch command:
patch -p1 < $(TOPDIR)/gdev/mod/linux/patches/gdev-nouveau-X.X.patch

as follow
hatem@hatem-VirtualBox:~/linux-2.6$ patch -p1 < ~/gdev/mod/linux/patches/gdev-nouveau-3.3.patch
patching file drivers/gpu/drm/nouveau/Makefile
Hunk #1 FAILED at 3.
1 out of 1 hunk FAILED -- saving rejects to file drivers/gpu/drm/nouveau/Makefile.rej
The next patch would create the file drivers/gpu/drm/nouveau/gdev_interface.c,
which already exists! Assume -R? [n] n
Apply anyway? [n] n
Skipping patch.
1 out of 1 hunk ignored
The next patch would create the file drivers/gpu/drm/nouveau/gdev_interface.h,
which already exists! Assume -R? [n] n
Apply anyway? [n] n
Skipping patch.
1 out of 1 hunk ignored
can't find file to patch at input line 574
Perhaps you used the wrong -p or --strip option?

The text leading up to this was:

|diff -crN a/drivers/gpu/drm/nouveau/nouveau_drv.c b/drivers/gpu/drm/nouveau/nouveau_drv.c
|*** a/drivers/gpu/drm/nouveau/nouveau_drv.c 2012-03-19 08:15:34.000000000 +0900

|--- b/drivers/gpu/drm/nouveau/nouveau_drv.c 2013-07-11 17:18:03.200173623 +0900

File to patch:

i want to know what is wrong ,and what should i enter in File to patch:
actually i am just a beginner ,so forgive me if it seems fool question.