linux-next: build failure after merge of the hmm tree

[Stephen Rothwell]

Hi all,

After merging the hmm tree, today's linux-next build (x86_64 allmodconfig)
failed like this:

mm/hmm.c: In function 'hmm_get_or_create':
mm/hmm.c:50:2: error: implicit declaration of function 'lockdep_assert_held_exclusive'; did you mean 'lockdep_assert_held_once'? [-Werror=implicit-function-declaration]
  lockdep_assert_held_exclusive(&mm->mmap_sem);
  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  lockdep_assert_held_once
drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c: In function 'amdgpu_ttm_tt_get_user_pages':
drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c:778:28: error: passing argument 2 of 'hmm_range_register' from incompatible pointer type [-Werror=incompatible-pointer-types]
  hmm_range_register(range, mm, start,
                            ^~
In file included from drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c:35:
include/linux/hmm.h:464:29: note: expected 'struct hmm_mirror *' but argument is of type 'struct mm_struct *'
          struct hmm_mirror *mirror,
          ~~~~~~~~~~~~~~~~~~~^~~~~~

Caused by commit

  e36acfe6c86d ("mm/hmm: Use hmm_mirror not mm as an argument for hmm_range_register")

interacting with commit

  66c45500bfdc ("drm/amdgpu: use new HMM APIs and helpers")

from the drm tree.

All I could do for now was to mark the AMDGPU driver broken.  Please
submit a merge for for me (and later Linus) to use.

-- 
Cheers,
Stephen Rothwell
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