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

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Date:   Thu, 12 Jan 2017 12:13:51 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Thierry Reding <thierry.reding@...il.com>
Cc:     Arnd Bergmann <arnd@...db.de>, David Airlie <airlied@...ux.ie>,
        Stephen Warren <swarren@...dotorg.org>,
        Alexandre Courbot <gnurou@...il.com>,
        Mikko Perttunen <mperttunen@...dia.com>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        dri-devel@...ts.freedesktop.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] drm: tegra: shut up harmless warning on NOMMU

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@...db.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