drm: avoid "possible bad bitmask?" warning
authorDave Gordon <david.s.gordon@intel.com>
Tue, 9 Aug 2016 17:35:10 +0000 (18:35 +0100)
committerDaniel Vetter <daniel.vetter@ffwll.ch>
Tue, 9 Aug 2016 20:18:26 +0000 (22:18 +0200)
Recent versions of gcc say this:

include/drm/i915_drm.h:96:34: warning: result of β€˜65535 << 20’
requires 37 bits to represent, but β€˜int’ only has 32 bits
[-Wshift-overflow=]

Reported-by: David Binderman <linuxdev.baldrick@gmail.com>
Signed-off-by: Dave Gordon <david.s.gordon@intel.com>
Cc: Dave Airlie <airlied@gmail.com>
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/1470764110-23855-1-git-send-email-david.s.gordon@intel.com
include/drm/i915_drm.h

index b1755f8..4e1b274 100644 (file)
@@ -93,6 +93,6 @@ extern bool i915_gpu_turbo_disable(void);
 #define    I845_TSEG_SIZE_1M   (3 << 1)
 
 #define INTEL_BSM 0x5c
-#define   INTEL_BSM_MASK (0xFFFF << 20)
+#define   INTEL_BSM_MASK       (-(1u << 20))
 
 #endif                         /* _I915_DRM_H_ */