drm/selftests/test-drm_mm: Mark 'hole_end' as always_unused

In the macro drm_mm_for_each_hole() 'hole_end' is provided as a
container for 'hole_start + pos->hole_size', but is not utilised in
this use-case.  We cannot simply delete the variable, so here we tell
the compiler that we're intentionally discarding the read value.

Fixes the following W=1 kernel build warning(s):

 drivers/gpu/drm/selftests/test-drm_mm.c: In function ‘assert_no_holes’:
 drivers/gpu/drm/selftests/test-drm_mm.c:57:18: warning: variable ‘hole_end’ set but not used [-Wunused-but-set-variable]

Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: "Christian König" <christian.koenig@amd.com>
Cc: Nirmoy Das <nirmoy.aiemd@gmail.com>
Cc: dri-devel@lists.freedesktop.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20201116174112.1833368-28-lee.jones@linaro.org

diff --git a/drivers/gpu/drm/selftests/test-drm_mm.c b/drivers/gpu/drm/selftests/test-drm_mm.c
index 95e212a9a74d2fd86fa4c3d2a99d6fc11848790c..b768b53c4aee3857b6adc70a61cc34474c7feca5 100644 (file)
--- a/drivers/gpu/drm/selftests/test-drm_mm.c
+++ b/drivers/gpu/drm/selftests/test-drm_mm.c
@@ -54,7 +54,7 @@ static int igt_sanitycheck(void *ignored)
 static bool assert_no_holes(const struct drm_mm *mm)
 {
        struct drm_mm_node *hole;
-       u64 hole_start, hole_end;
+       u64 hole_start, __always_unused hole_end;
        unsigned long count;
 
        count = 0;