amd-staging-drm-next, CIK apu, [TTM] Erroneous page count. Leaking pages. [BISECTED]

[Przemek Socha]

Hi All,
after today's sync with amd-staging-drm-next branch I have problems with my 
Mullins APU Netbook.
Kernel log is flooded with "[TTM] Erroneous page count. Leaking pages." 
message.

Bisected, and it seems that "drm/ttm: fix start page for huge page check in 
ttm_put_pages()" commit is causing this.

git bisect log:
git bisect start
# good: [c2af9f9e84183a4dbcb53a74abbe3362dc181682] drm/amd/display: fix cursor 
black issue
git bisect good c2af9f9e84183a4dbcb53a74abbe3362dc181682
# bad: [b07c394a327fc9e435ee03288584c111fa73d963] drm/amd/display: fix is odm 
head pipe logic
git bisect bad b07c394a327fc9e435ee03288584c111fa73d963
# bad: [367fa96ad66fef31bf73916cf4949c475f42563f] drm/amd/display: use proper 
formula to calculate bandwidth from timing
git bisect bad 367fa96ad66fef31bf73916cf4949c475f42563f
# good: [94275c6d27deebbce5055e1bb1959986051b93f2] drm/amdgpu: Add a check to 
avoid panic because of unexpected irqs
git bisect good 94275c6d27deebbce5055e1bb1959986051b93f2
# bad: [8198a32b1211c6f625623bae22629cf852531097] drm/amd/display: Initialize 
stream_update with memset
git bisect bad 8198a32b1211c6f625623bae22629cf852531097
# bad: [e16858a7e6e7dc00345703682d490b96f2883b99] drm/ttm: fix start page for 
huge page check in ttm_put_pages()
git bisect bad e16858a7e6e7dc00345703682d490b96f2883b99
# good: [b414dfd1f975bbf4c9ee4600f9bedcf77bae84ed] drm/ttm: fix out-of-bounds 
read in ttm_put_pages() v2
git bisect good b414dfd1f975bbf4c9ee4600f9bedcf77bae84ed
# first bad commit: [e16858a7e6e7dc00345703682d490b96f2883b99] drm/ttm: fix 
start page for huge page check in ttm_put_pages()

e16858a7e6e7dc00345703682d490b96f2883b99 is the first bad commit
commit e16858a7e6e7dc00345703682d490b96f2883b99
Author: Christian König <christian.koenig at amd.com>
Date:   Tue Apr 2 09:29:35 2019 +0200

    drm/ttm: fix start page for huge page check in ttm_put_pages()
    
    The first page entry is always the same with itself.
    
    Signed-off-by: Christian König <christian.koenig at amd.com>
    Reviewed-by: Michel Dänzer <michel.daenzer at amd.com>
    Reviewed-by: Junwei Zhang <Jerry.Zhang at amd.com>
    Reviewed-by: Huang Rui <ray.huang at amd.com>

Any help is appreciated.
Thanks,
Przemek.
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