drm: Make drm_local_map use a resource_size_t offset

This changes drm_local_map to use a resource_size for its "offset"
member instead of an unsigned long, thus allowing 32-bit machines
with a >32-bit physical address space to be able to store there
their register or framebuffer addresses when those are above 4G,
such as when using a PCI video card on a recent AMCC 440 SoC.

This patch isn't as "trivial" as it sounds: A few functions needed
to have some unsigned long/int changed to resource_size_t and a few
printk's had to be adjusted.

But also, because userspace isn't capable of passing such offsets,
I had to modify drm_find_matching_map() to ignore the offset passed
in for maps of type _DRM_FRAMEBUFFER or _DRM_REGISTERS.

If we ever support multiple _DRM_FRAMEBUFFER or _DRM_REGISTERS maps
for a given device, we might have to change that trick, but I don't
think that happens on any current driver.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Dave Airlie <airlied@linux.ie>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/gpu/drm/mga/mga_drv.h b/drivers/gpu/drm/mga/mga_drv.h
index 6bf4de990325..3d264f288237 100644
--- a/drivers/gpu/drm/mga/mga_drv.h
+++ b/drivers/gpu/drm/mga/mga_drv.h
@@ -317,8 +317,8 @@ do {									\
                 DRM_INFO( "\n" );                                       \
                 DRM_INFO( "   tail=0x%06x head=0x%06lx\n",              \
                           dev_priv->prim.tail,                          \
-                          MGA_READ( MGA_PRIMADDRESS ) -                 \
-                          dev_priv->primary->offset );                  \
+                          (unsigned long)(MGA_READ(MGA_PRIMADDRESS) -   \
+                                          dev_priv->primary->offset));  \
         }                                                               \
         if ( !test_bit( 0, &dev_priv->prim.wrapped ) ) {                \
                 if ( dev_priv->prim.space <                             \