Hello Chris Wilson,
The patch 5705670d0463: "drm: Track drm_mm allocators and show leaks
on shutdown" from Oct 31, 2016, leads to the following Smatch static
checker warning:
drivers/gpu/drm/drm_mm.c:1001 drm_mm_takedown()
warn: sleeping in atomic context
drivers/gpu/drm/drm_mm.c
991 * drm_mm_takedown - clean up a drm_mm allocator
992 * @mm: drm_mm allocator to clean up
993 *
994 * Note that it is a bug to call this function on an allocator which is not
995 * clean.
996 */
997 void drm_mm_takedown(struct drm_mm *mm)
998 {
999 if (WARN(!drm_mm_clean(mm),
1000 "Memory manager not clean during takedown.\n"))
--> 1001 show_leaks(mm);
^^^^^^^^^^^^^^^
The show_leaks() function does a GFP_KERNEL allocation but a couple
of the callers for drm_mm_takedown() are holding spinlocks so it's a
sleeping in atomic bug.
The problematic callers are ttm_range_man_fini_nocheck() and
amdgpu_gtt_mgr_fini().
1002 }
regards,
dan carpenter
