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drm/i915: avoid harmless empty-body warning

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The newly added assert_kernel_context_is_current introduces a warning
when built with W=1:

drivers/gpu/drm/i915/i915_gem.c: In function ‘assert_kernel_context_is_current’:
drivers/gpu/drm/i915/i915_gem.c:4417:63: error: suggest braces around empty body in an ‘else’ statement [-Werror=empty-body]

Changing the GEM_BUG_ON() macro from an empty definition to "do { } while (0)"
makes the macro more robust to use and avoids the warning.

Fixes: 3033acab07 ("drm/i915: Queue the idling context switch after all other timelines")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/20161108135834.2166677-1-arnd@arndb.de
This commit is contained in:
Arnd Bergmann 2016-11-08 14:58:17 +01:00 committed by Daniel Vetter
parent d7931c1879
commit 71d5895aac
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/i915/i915_gem.h
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@ -28,7 +28,7 @@
#ifdef CONFIG_DRM_I915_DEBUG_GEM
#define GEM_BUG_ON(expr) BUG_ON(expr)
#else
#define GEM_BUG_ON(expr)
#define GEM_BUG_ON(expr) do { } while (0)
#endif
#define I915_NUM_ENGINES 5