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mm/hmm: Use lockdep instead of comments

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So we can check locking at runtime.

Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Reviewed-by: Jérôme Glisse <jglisse@redhat.com>
Reviewed-by: John Hubbard <jhubbard@nvidia.com>
Reviewed-by: Ralph Campbell <rcampbell@nvidia.com>
Acked-by: Souptick Joarder <jrdr.linux@gmail.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Tested-by: Philip Yang <Philip.Yang@amd.com>
This commit is contained in:
Jason Gunthorpe 2019-05-23 11:23:30 -03:00
parent 47f245985a
commit 8a1a0cd0b7
1 changed files with 2 additions and 2 deletions
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4
mm/hmm.c
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@ -246,11 +246,11 @@ static const struct mmu_notifier_ops hmm_mmu_notifier_ops = {
*
* To start mirroring a process address space, the device driver must register
* an HMM mirror struct.
*
* THE mm->mmap_sem MUST BE HELD IN WRITE MODE !
*/
int hmm_mirror_register(struct hmm_mirror *mirror, struct mm_struct *mm)
{
lockdep_assert_held_exclusive(&mm->mmap_sem);
/* Sanity check */
if (!mm || !mirror || !mirror->ops)
return -EINVAL;