[PATCH] drm: tegra: shut up harmless warning on NOMMU

[Arnd Bergmann]

The tegra DRM driver is almost ok without an MMU, but there
is one small warning that I get:

drivers/gpu/drm/tegra/gem.c: In function 'tegra_drm_mmap':
drivers/gpu/drm/tegra/gem.c:508:12: unused variable 'prot'

This marks the variable as __maybe_unused instead.

Signed-off-by: Arnd Bergmann <arnd at arndb.de>
---
 drivers/gpu/drm/tegra/gem.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/tegra/gem.c b/drivers/gpu/drm/tegra/gem.c
index 7d853e6b5ff0..63f14b7a59a0 100644
--- a/drivers/gpu/drm/tegra/gem.c
+++ b/drivers/gpu/drm/tegra/gem.c
@@ -505,7 +505,7 @@ int tegra_drm_mmap(struct file *file, struct vm_area_struct *vma)
 
 		vma->vm_pgoff = vm_pgoff;
 	} else {
-		pgprot_t prot = vm_get_page_prot(vma->vm_flags);
+		pgprot_t prot __maybe_unused = vm_get_page_prot(vma->vm_flags);
 
 		vma->vm_flags |= VM_MIXEDMAP;
 		vma->vm_flags &= ~VM_PFNMAP;
-- 
2.9.0