[PATCH] drm: Fixes error with gcc 3.3.5 in i915 driver.

From: Torsten Hilbrich
Date: Tue Jun 23 2009 - 09:05:43 EST

When compiling with gcc 3.3.5 I got the following error message in the
module i915.ko:

ERROR: "__udivdi3" [drivers/gpu/drm/i915/i915.ko] undefined!

This error did not occur when compiling the same code in gcc 4.3.2.

This patch replaces the 64 bit division by a call of div_u64 to avoid
triggering the problem on the older compiler.

The code to be fixed was introduced in
commit 2c07245fb8f7f0a282282e5a9747e46defdb2cc7
drivers/gpu/drm/i915/intel_display.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c
index 3e1c781..306d198 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -1502,7 +1502,7 @@ igdng_compute_m_n(int bytes_per_pixel, int nlanes,

temp = (u64) DATA_N * pixel_clock;
temp = div_u64(temp, link_clock);
- m_n->gmch_m = (temp * bytes_per_pixel) / nlanes;
+ m_n->gmch_m = div_u64(temp * byte_per_pixel, nlanes);
m_n->gmch_n = DATA_N;
fdi_reduce_ratio(&m_n->gmch_m, &m_n->gmch_n);


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