From: Jordan Crouse <jcrouse@codeaurora.org>
Date: Thu, 27 May 2010 19:40:27 +0000 (-0600)
Subject: drm: Make sure the DRM offset matches the CPU
X-Git-Tag: v2.6.36-rc3~9^2~98^2
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=05269a3a5a78bb074413de495105d7a2686c4529;p=profile%2Fcommon%2Fkernel-common.git

drm: Make sure the DRM offset matches the CPU

The pgoff option in mmap() is defined as an unsigned long
so the offset generated by DRM needs to fit into
BITS_PER_LONG for the CPU in question.

Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>
---

diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c
index 33dad3f..8601b72 100644
--- a/drivers/gpu/drm/drm_gem.c
+++ b/drivers/gpu/drm/drm_gem.c
@@ -68,8 +68,18 @@
  * We make up offsets for buffer objects so we can recognize them at
  * mmap time.
  */
+
+/* pgoff in mmap is an unsigned long, so we need to make sure that
+ * the faked up offset will fit
+ */
+
+#if BITS_PER_LONG == 64
 #define DRM_FILE_PAGE_OFFSET_START ((0xFFFFFFFFUL >> PAGE_SHIFT) + 1)
 #define DRM_FILE_PAGE_OFFSET_SIZE ((0xFFFFFFFFUL >> PAGE_SHIFT) * 16)
+#else
+#define DRM_FILE_PAGE_OFFSET_START ((0xFFFFFFFUL >> PAGE_SHIFT) + 1)
+#define DRM_FILE_PAGE_OFFSET_SIZE ((0xFFFFFFFUL >> PAGE_SHIFT) * 16)
+#endif
 
 /**
  * Initialize the GEM device fields