2.6.36-rc2 build failure: implicit declaration of function 'seq_printf'

Commit 6ef3d4278034982c13df87c4a51e0445f762d316 causes a build failure for me:

,---- | CC [M] drivers/gpu/drm/i915/intel_overlay.o | drivers/gpu/drm/i915/intel_overlay.c: In function 'intel_overlay_print_error_state': | drivers/gpu/drm/i915/intel_overlay.c:1467: error: implicit declaration of function 'seq_printf' | make[4]: *** [drivers/gpu/drm/i915/intel_overlay.o] Error 1 `----

Adding a line with

#include <linux/seq_file.h>

to intel_overlay.c fixes this. Looking at include/drm/*.h, I notice that <linux/seq_file.h> is only #included if CONFIG_DEBUG_FS is set, which is not the case in my configuration.

Sven