From: Dave Gordon <david.s.gordon@intel.com>
Date: Tue, 9 Aug 2016 17:35:10 +0000 (+0100)
Subject: drm: avoid "possible bad bitmask?" warning
X-Git-Tag: v4.9-rc1~41^2~36^2~129
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=aac440ff22a27155ae08f4d0fd6ac2971bfc5f3d;p=karo-tx-linux.git

drm: avoid "possible bad bitmask?" warning

Recent versions of gcc say this:

include/drm/i915_drm.h:96:34: warning: result of ‘65535 << 20’
requires 37 bits to represent, but ‘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
---

diff --git a/include/drm/i915_drm.h b/include/drm/i915_drm.h
index b1755f8db36b..4e1b274e1164 100644
--- a/include/drm/i915_drm.h
+++ b/include/drm/i915_drm.h
@@ -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_ */