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path: root/drivers/gpu/drm/gma500/gtt.c
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Diffstat (limited to 'drivers/gpu/drm/gma500/gtt.c')
-rw-r--r--drivers/gpu/drm/gma500/gtt.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/gpu/drm/gma500/gtt.c b/drivers/gpu/drm/gma500/gtt.c
index db2e823e8951..54e5c9e1e6fa 100644
--- a/drivers/gpu/drm/gma500/gtt.c
+++ b/drivers/gpu/drm/gma500/gtt.c
@@ -39,6 +39,10 @@ static inline uint32_t psb_gtt_mask_pte(uint32_t pfn, int type)
{
uint32_t mask = PSB_PTE_VALID;
+ /* Ensure we explode rather than put an invalid low mapping of
+ a high mapping page into the gtt */
+ BUG_ON(pfn & ~(0xFFFFFFFF >> PAGE_SHIFT));
+
if (type & PSB_MMU_CACHED_MEMORY)
mask |= PSB_PTE_CACHED;
if (type & PSB_MMU_RO_MEMORY)
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