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Commit 05269a3a authored by Jordan Crouse's avatar Jordan Crouse Committed by Dave Airlie
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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: default avatarJordan Crouse <jcrouse@codeaurora.org>
Signed-off-by: default avatarDave Airlie <airlied@redhat.com>
parent 4b7fb9b5

drivers/gpu/drm/drm_gem.c

+10 −0
Original line number Diff line number Diff line
@@ -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